DoctorJ, I never found remoulade that tasty on shrimp, myself. 
I’ve got a lot of motivated type IIs who don’t take insulin, but do modify their behavior based on what their blood sugar is. If they see it’s drifting up, they’ll modify their diets and exercise more. That’s why I like to get them on a twice-a-day check at least 3 times a week. I’ve seen tons of type II folks not on insulin who have marvelous fasting glucose levels, but hit the 250 mark or more many evenings. If they only check in the AM, they never realize this. When they see the high PM levels, they kick up their exercise, watch what they eat later in the day, and get satisfaction when they bring the PM levels down. And they can make those adjustments in days or weeks, rather than waiting for the every 3 month feedback of the glycosylated hgb result.
But if my diabetic won’t do anything different based on his glucose level, then the need for more frequent checks disappears. So you’re correct: No need to check if nothing is to be done because of the information. But recognize that there are things a motivated individual can do with the information besides decide how much insulin to give.
As for inmates with pointy things: when they check in for sugar check, they’re issued a lancet and a syringe. Before they leave, they must return both. If they fail to do that,they are taken to the segregation unit and thoroughly searched. Then they stay in the segregation unit for a while.
And each diabetic has his own individual medication regimen, created by me and/or one of my colleagues after exam. A common type of regimen for a brittle diabetic would include 4 x a day checking, with a fixed dose of regular before eating a meal or the bedtime snack, a sliding scale of regular to normalize their sugars if they are running high, and a dose of Lantus insulin at bedtime. Just what the dose is depends on the individual diabetic’s needs.
We don’t use asparte insulin as it acts too damn fast. If there’s a delay between the inmate injecting the insulin in the health unit and him getting to eat, suddenly his glucose is 45 and falling and there’s trouble.
I don’t know if we have more diabetics in prison than not, given the enormous epidemic of diabetes out in public right now. But our diabetics sure come in sicker, as many (most) have not been taking care of themselves. The highest HgBA1C I ever saw was on an inmate when he arrived in prison. It was 20.
And if a diabetic inmate refuses the standard diabetic diet, eats the regular meals served, buys junk food in canteen, doesn’t use the exercise yard, and neglects to take his meds properly, then he’ll be out of control in prison.
And if a non-diabetic inmate sits around and eats all the time, doesn’t exercise, etc. he’ll pack on 50 lbs in his first 6 months in prison and voila, a new diabetic!