[krapp]

>For people who think this is wrong, assuming you accept the premise that they should be investigating rioters, what alternative is there to find out who they are?

Even accepting that premise, which I don't, there doesn't always need to be an alternative. The 4th Amendment appears to require far more specificity than this request allows. Political assembly and protests are obviously protected by the Constitution, and these 200 rioters are considered innocent until proven guilty.

If law enforcement can't get a valid warrant then they should lose. They can go home and polish their batons.

/IANAL