My sons friend smokes and one day he decided that he should go with him. he took only a few puffs, and then his friend took back the cigerette. Then he saw the cops come. His friend paniced and threw a cigarette box and drug paraphenalia into the bushes. The cops searched them and found nothing on my son, but found a box of cigarettes on his friend. They later found the drug paraphenalia and the other cigarette box. My sons friend friend admitted that both were his later. He is charged with posession of illegal substances even though none were found on him, what should i do, i know what he did was wrong and i do not condone him, but i wish to help my child. what actions should i take, is there a way we can be proven non-guilty?