Incarcerating people for abuse of themselves is another story. If the meth heads want to ingest poison why stop them? Pile it as high as an elephants eye and watch em drop like flies! Problem solved and no dogs killed.
The problem with such a rationale is that it can be used to contravene the Constitution and cover almost anything depending on the viewpoint. Obama could say, for instance, that the Tea Party, is endangering his efforts to improve the US and save the economy. Therefore, teapartiers must be locked up for the duration of the Obama declared emergency.