i have heard that handcuffs shit before but i think its just one of the bullshit rumors.
about 5 years ago a guy i knew got punched in the face by a cop for being a smart ass.he wasnt being arrested or anything i heard he got fired.
cops are wierd with what they care about, one night there was this fight about 15 people involved like 5 people went to hospital cops watched the whole thing and didnt try to stop it at all my mate said they went and busted people on the train station for not having tickets after it was over.