Originally Posted by
OldGoat
1) Is the hit rate different by airport?
2) Do different travel patterns change a passenger's hit rate?
3) Why, after vetting in excess of that given to the TSOs, are PreCheck passengers relegated to the groping lanes so frequently?
TSA is not forthcoming about how,
exactly, one qualifies for PreCheck. (Being an elite FF of selected airlines at selected airports makes one eligible, but doesn't guarantee selection. Being a GE member makes one eligible, but doesn't guarantee selection. The exact algorithm used to determine whether an eligible person is selected has not been made public.)
Consequently, the answers to your questions above are:
1) TSA knows, but won't say.
2) TSA knows, but won't say.
3) TSA knows, but won't say.