You all were taught in the police academy that handcuffs are only a temporary restraining device. Leaving a prisoner out of view, in the back of a wagon or interview room even for a few seconds may invite an escape attempt. That mild and quiet prisoner may well believe he’s wanted for a murder that has not even been discovered when you have him in custody for something minor.
There were at last count over 200 videos on defeating locks on Youtube. Now the creeps have shown the world how to escape from handcuffs at Google Video.
Aside from the technique depicted on the video below there are others that utilize ballpoint pen refills, springs and safety pins. Some criminals have even concealed handcuff keys with tape inside the rear of their pants waistband in order to free themselves when handcuffed behind their backs.
Let's error on the side of caution with extra vigilance so you can go home to your families at the end of watch. Funerals for fellow cops are always a miserable event.