My son had these little white pills in his pocket, and someone told me they were o p 40's, and I haven't a clue what o p even IS, lol, & there isn't a darned thing on the pill, they are white, round and a little larger than a baby aspirin. I m concerned ... that he's using again and just want a confirmation. (Why in the HE&& would a pill be made w/o a dam thing on it??? ) thanks for any help I can get, I am new to this so I hope that I can FIND an answer once 'u've' given me one! lololol