One aspect not mentioned is this:
As paramedics, we need to be able to move fluidly through all social strata and have continuing access to EVERYONE. If any segment of the population has to be concerned that, under anything less than the most horrendous of circumstances, you as a medic are an arm of the Law, then that may mean someone will hesitate to call for help. Why put yourself out of business?
Let's face it, the lower strata of society are the most vulnerable to this sort of thing. If you pull this on the Mayor, YOU'RE the one at risk!
Even Junkies deserve a chance without you CHOOSING to drop a dime on him/her. Unless you do that with everyone, you should do that with no one.
That's the job, Folks! Doling out chances indiscriminately. You do, however have a duty to report anything within the medical realm regarding the circumstances of the incident; that could include psychological trauma resulting from illegal activity. Just be very, very specific without revealing anything but the essentials for the hospital staff. From there on, it's in their court.
And on a more practical note; once you document or pull a cop into things other than good patient care, you can count on spending a certain chunk of your future being part of the CASE as well as the CALL! It's your choice.