Unfortunately that's a legal minefield. Mantraps have various legal standing around the world, but you are likely to be successfully sued if they result in inju

Unfortunately that's a legal minefield. Mantraps have various legal standing around the world, but you are likely to be successfully sued if they result in injury. Seems likely in the case of a panicky criminal who finds themselves suddenly boxed in with mysterious gas. There are other considerations as well (via wikipedia [1]) : "There is also the possibility that such traps could endanger emergency service personnel such as firefighters who must forcefully enter such buildings during emergencies. As noted in the important US court case of Katko v. Briney, "the law has always placed a higher value upon human safety than upon mere rights of property" [1] https://en.wikipedia.org/wiki/Mantrap_(snare) https://en.wikipedia.org/wiki/Mantrap_(snare)