My 18 year old daughter mentioned kids are talking about this a week or two ago.
Obviously if it is really happening we should be concerned.
But, on the little I know about drugs (not a lot!), my understanding is that anaesthetics have to get into our bloodstream pretty efficiently to have noticeable effect.
That means they have to be injested, inhaled, or injected into a vein.
Otherwise, if it is injected not into a vein, the worst that could happen is local anasthesia, the skin around the puncture could go numb, like as happens with dental injections, but not enough would get to our bloodstream to have any effect on consciousness.
What are the chances of a random opportunistic jab hitting and staying in a vein for the duration of the jab, without the jabbed even noticing?
Pretty much zero I would guess.
So I doubt the truth of the rumor.
Could that be overthinking things?