There would be some benefits. For example, if it became trivial to detect that a person was a user of illegal drugs, we'd very quickly change our drug laws to s

There would be some benefits. For example, if it became trivial to detect that a person was a user of illegal drugs, we'd very quickly change our drug laws to something more congruent with reality. Instead, we are in a situation where our drug laws are only tolerated because they're completely financially unrealistic to enforce the way they're written. That leads to selective enforcement, which gives authorities way too much discretionary power.