Smoking in train toilets

[MOH]

Once again today, the toilet on the Sligo train randomly decided to start accusing me of smoking, with a recorded announcement advising me that this was illegal and a staff member had been notified (ha!).

This has happened a few times. Is there any actual smoke detector or does it go off at random intervals?

It's quite annoying, as the message is quite loud and repeats a few times, plus it's embarrassing if anyone's waiting outside who then thinks you are actually smoking.

(In fact, if I do end up getting dirty looks from other passengers as a result of being verbally accused of something illegal with no basis, would that constitute slander?)

*Clarification: I've never smoked