Methane is flammable in sufficient concentrations. (The Skull & Bones Club probably has minutes on this.) Nonetheless, it would be better to detect the gas composition before the thermal excursion occurs.
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In vino veritas; in cervisia carmen; in aqua E. coli.
Angry employees are most likely to start a fire in the bathroom, since video surveillance is not allowed, and they will be long gone before the fire gets big enough to draw attention. It's an ideal spot for this device.
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Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety. Ben Franklin