Shared some time with the City Attorney here over these.  I always follow the advice of my lawyers, and they advised that contraband ought be destroyed without delay, and that the most effective method was by burning. 
Deep conversation worth far more than I could have afforded to pay for followed this.  Possibly the best investment of the year was that hour of our time together.  It wouldn't have been the same without your efforts, so I am in your debt.

Just know that what you do ripples out into the world and has many positive effects.