I'd like to discover if anyone enters the Forbidden Lab between Monday (when I return home) and the next time I am here.
I guess I could stick a bit of scotch tape on the door as I leave, but there's the off-chance that the tape could be removed by housekeeping.
So, I've come to the conclusion that I need some sort of bait; something that I can leave in plain sight in the lab that any person entering will, must take.
It's probably more than one item, really.
A pack of cigarettes, a chocolate bar, a dollar, and three quarters? The absence of any of these items would indicate that someone else had enetered the lab.
Any better ideas? Something in addition?