Okay, as someone who works in the meat industry, I can say with relative certainly that all the chicken that could have come into contact with the boy's body would have been thrown out and the area deep cleaned. They aren't just going to say "Oh well, federal regulations let us have 25 ppm of ground teenager, just mix it in with the good stuff and ship it". These companies regularly recall entire batches of meat (worth $1,000s of dollars) if there is so much as a bolt unaccounted for that someone might choke on.

Earlier this week at the place I work, one of the other butchers had a seizure and they threw out all of the stuff he was working on at the time (probably about $200-300) just in case he got some blood on it when he bit his tongue.