This is a genuine question, I'm not taking the piss here.
Living in a level four lockdown police state (New Zealand) with no injected people nearby to test this on, I can't confirm or deny this myself.
A lot of people are saying that if you install a bluetooth scanner app on your phone it will pick up any injected "covid vaccinated" people as UNKNOWN DEVICES. But as with all things coronahoax, there is a sea of misinformation out there.
This post by @dzoji covers it all in more detail.
@dzoji/bluetooth-lov-na-vakcinisane-bluetooth-hunting-for-vaccinated-people