Smile! You're on Candid Camera!

A pair of substandard foster parents have been charged with battery and neglect for the physical abuse of their 15 year old charge (it seems there’ve quite a few child abuse cases of late). What caught my eye here was how they got caught.

Do any electronics Dopers know if this explanation for the recording sounds plausible?

Do any electronics Dopers know if this explanation for the recording sounds plausible?

You can certainly buy ‘video-extenders’ which broadcast your tv signal (very) locally; it means you can site the receiver in your bedroom without having to cable it.

Given that (a) this technology exists and (b) I wouldn’t expect every unit of a mass-produced product to send on a different frequency, I’d say it was at least theoretically possible.