Yes, it sends the wrong message to kids. Drug thresholds should always go down, not up. By raising the threshold, the organization is silently green--lighting a certain amount of marijuana usage. Smoking marijuana is an illegal activity in most states and situations. Therefore, the testing threshold should reflect discouragement from partaking in the activity.
Raising the marijuana threshold for Olympians does not send the wrong message to kids. The amount was raised tenfold in 2013. The substance does not enhance performance. It is recreational, and banning marijuana would be like disallowing the athletes to drink alcohol. Marijuana usage among the population has lost its social stigma.
No, the increased limit for marijuana does not send a bad message to kids. Marijuana is rapidly losing the old stigmas based on exaggerated science, and have already been legalized in several states as an alternative to alcohol. Maintaining stringent WADA limits would be hypocritical and out of step with reality. It is unlikely any kids would view find anything respectful in this dated stance.
Numerous studies show that marijuana is safer than the legal drug of alcohol. It is also the best pain management treatment for many cancer patients and helps them maintain their appetite. The World Anti-Doping Agency (WADA) recognized that marijuana is one of the least problematic drugs, and adjusted their standards accordingly.