If your in the US, your better of just forgetting it and be extremely cautious of going back to that site. If there are more plants there or in the area, there maybe people watching and you have to ask yourself, is the reward worth the risk, especially knowning that someone else knows what is there.... Indoors is the only way to go, only way to get caught is to be stupid.... dont pay your electric bill, vent into the sewer, etc,etc

good luck tho