I might have alzheimers, but I have to say this again because it kills me that people are so stupid. I have tricked people into admitting they have drugs on them by turning my pager off and then telling them that the pager is a drug detection device. I run it over their body, and then turn it on and it makes a beep. I then inform them that my detection device has indicated that there are drugs on the person.
The two times I have tried it, the person started crying and just told me where the drugs were. Of course, I only do it if I have enough probable cause to search them and their surroundings, anyway, but it makes me laugh that they fall for it. And, yes, it is legal for me to lie to them. And why not, they lie to me all the time, and unless it is about their identity, I can't do a thing about it. Turnabout is fair play?