[J. T. Toad]

Great. Instead of busting/investigating those who return tanks like this, I imagine I will have to buy a new tank (remember the asinine OPD) and be fingerprinted along with submitting an application to obtain a permit for the possession of a known WMD.

This is based on the fact that very very few people would ever come into contact with Anhydrous Ammonia (no I don't mean Windex, the commercial grade stuff) and I would imagine just a hint of it would turn brass green in a very very short time.