Little green 16.4oz camping propane tank leaking?

Buying used gear there is always a risk involved. Not getting into the debate above me safety first is always "no flames" is the safest method. Looking at the canister I have says that as well. Definitely dispose of the unit after it drains. And Mr. Propane there are adapters sold everywhere to refill these things, I did not know it was illegal for private parties to do so though. Why sell the adapters then? I do know about the transportation issues it's on the canister as well.