Thes staunch detectives act behind the scenes to solve some of the world's most unusual crimes.

The Secret Service is more than black sunglasses, ear pieces and two piece suits.

They're also an elite team of investigators solving some of the nation's biggest crimes, sometimes using nothing more than a blot of ink.

Here we are, the lobby of the Secret Service.

These were the only authorized shots we could get upstairs in the lab.

We got to see all the high tech machines analysts use in forensic investigations.

They have names with things like 8000 after them, so you know they're complicated.

Did you film a printer?

I did.

The lab includes people like Trista, who specializes in handwriting analysis to investigate threat letters or ransom notes.

Jeffrey investigates fraudulent items like IEDs, travelers checks, credit cards and Irena.

She works in the International Inc Library.

My name is Irina Geiman.

I am a document analyst with the United States Secret Service.

The Secret Service has the largest in hclibrary in the world.

There are over 12,000 inks.

They're currently in a collection.

This'll includes Pens Bottled Inc and printer cartridges.

Basically, this team of scientists is using ink to help solve crimes.

They're Inc investigators.

Uh, no.

Don't do that.

Okay, so here's an example.

Someone writes a threatening letter to the president.

Irena will sample that ink and then compare it to her collection.

Exactly.

She can figure out what kind of ink was used, and hopefully it helps solve the case.

Here's another Inc example.

No, give me that script.

The most counterfeited banknotes within the United States is $20 and it's printed within China, which means somebody takes their very simple at home printer and decides to print money.

Irena could compare the counterfeit currency to any printers found at the scene of the crime and helped make a match.

Okay, time for a little science.

Here's why you need 12,000 samples of Let's be honest, mostly black ink, a lot of the black inks and they're just black.

They're actually a collection of different color components that could be a blues and reds and yellows, maybe a little bit of green.

Irena Ken, for lack of a better term sequence, black ink like you would DNA and find the exact breakdown of color.

That's how she could make a match.

So what appears Black at a first glance is actually extremely different on the inside.

And it's really fun as a chemist to be able to take the ink apart and see how it's made.

I'm a nerd at heart.

I love the chemist Salmon.

I love the mystery of solving the case.

I just really love what I do.

So it may not look exactly like it's on TV, but it's really fun to be in the lab and to be able to do any analysis and to be able to help and assist all the law enforcement agencies that I work with daily.

So arena.

Can you give us any more examples?

It's on a need to know basis, and you do not need to know.

Well, it looks like this case is all dried up.

I've been threatened by Haiti with voodoo over food.

I've taken mangoes from passengers from Jamaica and been threatened with my life.

Never a dull moment here, a J F.

K.

Make it easier.

That's it.

The reason why we're confiscating all this stuff is not because it's harmful to the human being.

It's harmful for our plants and our animals.

This is a big port.

Last month we processed at 1.5 million passengers.

You figured between fruits and vegetables.

We're talking about two or 300 kg today in just one terminal.

So you're talking about 4 to £600.

What kind of foods are you confiscating?

Every day is different.

Every season is different.

Chinese New Year, Christmas, Easter We have beef candy from China.

Serrano Ham from Spain.

We have lots of avocados.

Salami from Italy.

No, Pedro, I take that back.

Salami supremo Spain.

Also, once the food items seized, it's put in what we call the contraband been.

We drag a contrary and been across the terminal.

It's about a block long.

Get a little exercise and begin the process of grinding up all the prohibited food items.

We're at the grinder table.

The officer will look and see if there's any little exit holes.

Entry holes and that's what you're gonna find the insect.

Do you enjoy that?

Part of the process is a kind of a stress reliever for you.

The grinder is great.

Sometimes I go home with a little bit of mango juice and passion fruit juice on.

It just happened fun, the water splashing in your face.

But this is what we have to do to protect American agriculture is part of our job.

Mhm.

There's a crime.

Detectives follow the clues.

They get close, but then they reach the water.

So they call in the underwater criminal investigator.

That's Mike Barry.

Hold on.

Thistle is Mike Barry E Dive in very strange places, looking for very strange things.

Mike has been an underwater criminal investigator for 35 years.

How easy is it to get rid of a murder weapon?

All it is is a flick of the wrist on someone's mind.

That murder weapon is forever gone.

They have no idea There are people like me crazy enough to go down there.

And search law enforcement depends on guys like Mike to preserve and recover evidence.

Your three cores in underwater criminal investigation, his body recovery, vehicle recovery and evidence recovery.

I get called about twice a week, sometimes more, sometimes less, and when a call comes in, chances are mix in for a challenge.

Some of these locations are absolutely disgusting.

Are typical.

Dive site is dark.

It's deep.

It's cold, It's full of obstructions.

It's contaminated.

The danger is there.

When you get in the water, you know I've had murders.

Tell me, you know you'll never find it.

I said, Well, we'll see.

Go ahead.

I've won a four diver one.

There's nothing like finding the target when your hand hits it and you feel it and you realize you've got it.

For a public safety diver, uh, there's no greater thing.

And when he's out there searching for a body, I look at it as an honor because you realized the importance of what you're asked to do.

There's a family, and there's no closure until you bring them up.

You know, not every diver conduce this.

Not everybody has it in their DNA.

It's what I was meant to do.

I couldn't think of anything better to do with my life.

Truth is, I can't wait for the next call to help someone in some way, either to bring closure or to bring a conviction.

Mhm.

Fancy going shopping?

Stop!

No, no, no, no whistling in the Burlington Arcade.

Who are you?

We are the Berlin's and beetles.

Probably the oldest and smallest police force in the world.

You could say that we police your manners, right?

Okay.

Tell us your story.

The Beatles story started before we get into that.

What actually is a beetle?

To be honest with you, I don't think anybody really knows way predate any police force in the country.

Right back to the story.

Go ahead, Mark.

The Beatles story started at this arcade.

Okay.

Are they gained here?

No.

Eso.

It's just like a shopping center, right?

Yeah.

Okay.

Third time, Lucky.

Go ahead, Mark.

The Beatles story started on the 20th of March 18 19.

London was very different.

People didn't really trust the water, so they drank even gin or beer.

Obviously that least a certain part of behavior.

So the Beatles role really was to keep order within the arcade.

And in fact, that tradition has carried on right away for it.

Today, our uniforms are made up of several different layers.

We first of all, put on our waistcoats in our front coats on our top hats in the summer or the autumn.

In the winter, you will still put on your waistcoats.

You will then put on your cape and your top hat.

The original rules here were no whistling because the pig pockets with whistle signals to one another.

No drunken.

This play a musical instrument.

You're not supposed to hurry.

Some gentleman like her unladylike carry your own parcels.

You mustn't bring a bicycle Unaccompanied.

Ladies, by the way, weren't also allowed them a lot of those rules.

We couldn't enforce that we still try to enforce the no hurrying.

We still try to enforce the no whistling.

It's all about behavior.

As long as you're respecting those around you and respecting the arcade, you'll be left alone.

And I put this uniform on.

I represent nearly 200 years worth of history.

It makes me immensely proud.

Yeah, I want to stay here when I retired from one interview.

That's actually true, by the way, isn't just the spill.

Thes are sea turtle eggs, and there are two ways this situation can play out.

There's either or there's so how can we make sure this doesn't end up like this?

Well, take a look again.

These aren't your ordinary sea turtle eggs.

These eggs could one day take down an entire poaching network.

The story of these eggs starts in Ann Arbor, Michigan.

Hi, I'm Kim Williams Keone, and I am a conservation Ecologist.

Kim does research on a wide variety of animals, but we're here to talk about endangered and threatened sea turtles with sea turtles in Central America.

There's an issue of poaching, of the nests for consumption of the eggs, and so her team has developed a unique solution to gather more information about the poaching trade.

Fake eggs With GPS Trackers We can hide these fake turtle eggs in sea turtle nests.

Our hope is that thes eggs will get poached along with the others and transmit information on their locations.

Where is it that they go after they're taken from the beach?

But for this to work, the fake eggs have to be convincing.

They have to have the right field because sea turtle eggs are kind of a little soft and squishy.

They're not like chicken eggs.

We've been using a three D printer and a kind of flexible plastic, but they still don't look quite right.

And this is when our story moves to Los Angeles.

Hello, I'm Lauren and Lauren works in Hollywood.

My day to day job is I work on set as a makeup artist, which could be beauty makeup, prosthetics, creature design, wigs, blood.

So it made sense for Lauren to help Kim make fake eggs.

We needed these eggs toe look realistic, so feel realistic.

And so that's kind of where I've come in.

It was like the best way that I could use my skills making prosthetics, but to actually like help a whole species of turtles.

It was like it's a dream job.

After months of revisions, it's time to put these eggs to the test in Costa Rica.

Hi again.

You remember Kim.

She's here to deploy the eggs herself on a protected conservation area.

This is a place that's very special because it's a very important nesting site.

Tonight, a sea turtle will come, and I can test out putting the false sea turtle eggs in the nest.

Not only will this project provide Kim's team with valuable information on poaching, she and Lauren hope it will inspire others as well.

Wildlife poaching could be abstract or too depressing to even think about.

Something about this project kind of captures people's attention.

Here's this very simple, unique solution that I think then serves as a jumping off point for people's imaginations toe.

Learn more about this trade.

All of us working on this project are just doing it in our weird little nooks and wherever we can.

And it just goes to show there's so many little ways that everyone can help.

You don't have to be making fake turtle eggs to make a difference.

You can make a difference in your own way.

Mm hmm.