CIA Flaps and Seals Manual John Harrison Paladin Press 1975.pdf

Many of the techniques taught here were used by CIA and FBI personnel to effect surreptitious openings of mail during the past three decades. Chapters include Dry Openings, Wet Openings, Steam Openings, Re-Sealing, Traps and much more. A companion piece to Locks, Picks, and Clicks, this book will be an invaluable resource in determining whether your mail has been tampered with or opened.