A filter doesn't need to be perfect to be worthwhile - just to pull some made-up numbers out of nowhere, if 1/100 options are worth investigating, and your filt

A filter doesn't need to be perfect to be worthwhile - just to pull some made-up numbers out of nowhere, if 1/100 options are worth investigating, and your filter gives you true positives 70% of the time and false positives 30% of the time, using that filter gives you about twice as much of a return on your investment as skipping the filter and investigating everything.