Even if it has been discussed in roll call meetings, what advice do you think was given to them? I'd bet it was based on the letters from the AG and/or DCJIS. Once again, the cops aren't lawyers. They've gotten advice from lawyers (bad advice, but still advice that they can point to).
As for a civil rights lawsuit, 1) they will be defended by their department, 2) their defense in the lawsuit will be that they followed the advice given to them by the AG's office and the DCJIS. That's a pretty good defense that they did not knowingly infringe on someone's civil rights, particularly given the courts here in MA (even the federal court).
Finally, I know an attorney who sued a local police department. I can tell you that he received frequent retribution from the department -- he was given bogus traffic tickets many times by officers in that department. He also received threatening phone calls, hangup calls, and his house was vandalized.
ETA: please realize that I'm not saying that I like what I predict will happen, because I don't. But that is what I expect will happen.