When did SSSS start? I thought it was post-2001. The author writes: "The “Do Search” list isn’t new. It existed pre-9/11. I know because I was on it when I beg

When did SSSS start? I thought it was post-2001. The author writes: "The “Do Search” list isn’t new. It existed pre-9/11. I know because I was on it when I began flying au naturale. Two years before then ... When 9/11 happened, and airport security was raised to code ridiculous, I wondered how much had been missed by screeners leading up to that fateful day. Who had they missed, what had they missed while believing some theory about the threat level of my hair?" What was the selection criteria before then?