ED...from what I have read, the LA folks were talking about setting up a voluntary register of men who have sex with men(MSM) and publicising it to make young MSM more aware of the dangers they face.
Of course "rounding up" as mentioned above would be unworkable, and is just some of Ian's obstructive rhetoric.
Once on the register it would be compulsory to test every six months.
I don't think criminalisation would have to be brought in, as it would soon become "socially unacceptable" NOT to be tested.
I would make sense to contact trace every new positive test.
Just another tool in the armoury against the epidemic.

The agencies are at last beginning to understand the gravity of the problem by proposing routine testing in designated areas, but this is a huge, time consuming operation to no real purpose as they are aware that by far the greatest rates of infection are amongst MSM.

"Routine testing in designated areas" is simply a piece of window dressing.