What's the issue with syringes? We have horses so we have
syringes. You can't wait for the vet on a colic, you have
to inject them with the stuff to relax their gut ASAP. You
also need to do it from time to time when the farrier or
horse-dentist (you don't want to know about this one) visit.

If you're one of the 1-in-10 with diabetes, you have syringes
and needles (which is where the fishermen get them). But
you can buy the OTC (over the counter) at serious farm supply
outlets. I have to laugh when I see they're supposedly controlled
items.

The only time a cop can hassle you for syringes is when they
find something worthy of injection.

Then again, I also occasionally carry around 'horsey downer' so
maybe I'm a sitting duck. Though I can't imagine how little of
this stuff that puts a 1000# animal to sleep wouldn't just kill
a human would be.