Pilots have rules like that and they seem to work. But I suppose the massive regulation of airline safety makes it rather much easier to implement. But how are

Pilots have rules like that and they seem to work. But I suppose the massive regulation of airline safety makes it rather much easier to implement. But how are they enforcing the anti drug stuff? A relative is a trucker and I recall him telling me it wasn't worth screwing around with alertness meds (speed, modafinil, etc) due to risks of getting caught. (And some similar stuff for taking on passengers/hitchhikers?) Seems like if that kind of oversight is in place then adding sleep restrictions is not hard. Or do you mean that they'd technically have had enough time to sleep, but in reality they weren't actually sleeping, but short of invasive biomonitoring it's impossible to tell? (One could be in bed, reading, for example.)