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Twenty-year-old Douglas Corpy steps carefully as he descends a staircase.

He's wearing handcuffs.

His ankles are shackled together and he's blindfolded.

So it's no surprise that after a few cautious steps, Douglas trips.

Two sets of hands though, firmly grip his arms and stop him from falling, and then together,

all but dragged by his captors, Douglas continues down the stairs.

But despite being bound in chain, Douglas is not afraid, because he's volunteered to put himself

in this unusual situation. A few days ago, Douglas read an ad in the college paper offering students the chance to earn $15 a day.

All they had to do was participate in a two-week psychological study of prison life.

Like many students, Douglas is usually short of cash, so he applied in the hopes of making

an easy 200 bucks.

Now his participation in the study is just beginning and as the handcuffs bite into his wrists,

Douglas can't help being impressed at how accurately the organizers have mimicked the prison experience.

Douglas shuffles forward another few paces before he's

roughly yanked to a stop. His blindfold is pulled off and Douglas winces at the

bright fluorescent lights overhead. The other students acting as prison guards then remove his

handcuffs and Douglas flexes his wrists in relief. Even though he knows

this is what he signed up for when he joined the experiment.

...