Stipulating your claim (are you a jurist?), how does this shake out? Do you expect the likelihood of referral to law enforcement/prosecution to be zero? If it is non-zero, how do you expect the set of self-incriminating surveys to be partitioned? Is it possible that the school administrator will consider the wealth of a student's parents, and their propensity to seek redress through the representation of an attorney? This would make these surveys more troubling, not less, because now they're putting just the poor kids into "real, not baseless" criminal proceedings.