The sentence is referring to a movie set in Ireland, in which some drug-traffickers are trying to get a big pack from the sea. There is a local police officer very peculiar (kind of disappointed with men and everything) with a very strict code. The sentence defines him: His main flaws are that he's close-up, he's a bit of a maverick and he does take the odd illegal substance just to try them out. The part that worries me : "he does take the odd illegal substance just to try them out" is a little odd for me". In the movie he is not seen taking drug at all (only he puts some minimal portion on his tongue with a finger from a little bag he finds into a pocket of a boy killed in a traffic accdient. He empties the rest) Is the sentence saying "...toma la extraña substancia ilegal, tan sólo para ponerlos a prueba." Being "them" the drug-traffickers" ? Thanks for your help.