A friend of is wondering how one would score on the streets. He lives near a very large city known for its heroin. He thinks a specfic section of the city that is known for this type of activity and is wealthy would be the safest place for a person to go. There are 2 parks located within a few blocks of one of the major needle exchange programs. According to their website that needle exchange program recieves about 100 visits in the 3 hour window which it is allowed to be open for each day. It appears a high traffic area for users. My friend is young (18), skinny, and pale. He dosn't really look like he could possibly be a cop. My friend thinks such an appearence would be advantageous. He is thinking about following someone as they leave the needle exchange program and approaching them about a block later. He can do things like this very discreetly. He would then ask them if they could give him a tour of the neighborhood, offering them money. He would look for a young person, who appears desperate, but not crazy. My friend is wondering if this is a good idea... or if anyone has any advice.