Saw a PSA on the tube last night (I don't often watch TV so apologies if this is "old news"). Issue was basically: "lock up your Rx medications so folks living/visiting your home can't help themselves to them, discretely".
[I guess I've never had any Rx that I'd imagine anyone ever *wanting* to take without cause! :< ]When younger, as a goof, we'd fill the medicine cabinet with *marbles* (e.g., prior to hosting a party) as a crude "indicator" that someone was *snooping* (again, nothing in there worth taking so the idea was just to sort out which of your "friends" happened to be NOSEY!).
[Marbles rolling out of a cabinet as an unsuspecting bloke opens it make a helluva racket AND scare the shit out of the culprit: "Oh, crap! I've got to clean this up QUICK! And, hope I get ALL of them even those that might have rolled UNDER something!"]Of course, it does nothing to prevent the culprit from seeing and/or taking any of the items in that cabinet. It's just an *indicator*.
It seems to me that there should be a cheap way of making something (less kludgey) that achieved the same results. The trick would be that if it became widely used, a "potential culprit" would be alerted to its potential presence. And, *might* be able to take steps to circumvent its "detection" function.
[E.g., a simple device could detect *light* falling on it and trip its indicator. This could be thwarted by opening the cabinet in the dark, etc. The marble hack could be thwarted by prepositioning a bag/bucket to capture the potentially present marbles AS they exit the enclosure; then, pour them back in place as you reclose the door -- the home occupant would be hard pressed to know that they had been removed and replaced in this way!]Ideally, something small, unobtrusive, inexpensive -- that could become a ubiquitous part of "at risk" medicine cabinets (sold at your local discount store)?