Almost 150 years ago, President Lincoln found it necessary to hire a private investigator - Alan Pinkerton - for protection. And that was the beginning of the Secret Service. Since that time, federal police authority has grown in depth, scope, and to a large number of multi-letter agencies - CID, OSI, NIS, FBI, CIA, INS, IRS, DEA, BATF, etc. Now we have the ""Federal Air Transportation Airport Security Service."" Can't you see them now, these highly trained men and women in their black outfits w…