Person X has a genetic predisposition that results in anger control issues in 87% of people, so they must subscribe to weekly anger management counselling or they'll be denied access to public areas such as malls and schools. The government certified and licensed suppliers are A, B, C.
Imagine the profits of legally compelling people to buy your stuff. History shows there would be a long lineup of people eager to exploit something like that.
I don't think the government should be imposing anger management counselling on people in the first place. That has nothing to do with concern about DNA, and everything to do with concern about the government being able to tell me what to do when I've not been convicted of a crime.
A lot of it would be based on junk science and the low rate of offenders, because the diagnosis is bullshit, would be touted as evidence of the value the program is providing.
What if it's not based on junk science, but on good science?