This is not good.
It’s bad enough that people are attacking each other so frequently but to come up with some new really malicious thing like this is evil to the core.
God only knows what’s in those needles. There’s stuff that can kill very quickly or cause you problems for the rest of your life.
And how do medical personnel even know where to start looking for whatever substance it was and how to counter act it.
IMO, the only solution is to catch the person in the act and give him a good dose of what he’s assaulting others with.
Fentanyl