Should they plan on hurling you off the boat in multiple directions at once through the courtesy of high explosives, the EXPRAY identification kit ($90) will come in handy. It consists of special, white, laminated test papers and two spray cans, E and X. You rub the papers over any surface, then spritz the paper with the E spray. If there's even a microgram of TNT, a dark violet stain will appear. If you don't see anything, spray the paper with canister X. If plastic explosives were touched, you'll see a pink stain.