A location used to secretly pass items between two people, without requiring them to meet is called a dead drop.
You've probably seen those scenes in spy movies where the hero walks up, sits on a bench next to someone else, says the secret passcode, and the stranger hands over an envelope or walks away, conveniently leaving their briefcase behind. This is a live drop, because both people were there at the same time and an item changed hands. A dead drop is the opposite—one person leaves it without knowing if the other has—or will ever—pick it up. For that reason, dead drops need to be well hidden, but not so hidden that someone can't find it when it's needed.
Granted, you may not need to do this on a regular basis, but leaving a dead drop can be useful in a number of ways:
Geocaching is essentially the gamified hunt for dead drops, which can contain anything from prizes to secret messages to clues to find the next drop. Similarly, you can use dead drops to start your own scavenger hunt or game with friends for fun, charity, or just to explore an area you're visiting.
• Leaving a dead drop for a friend gives you a way to leave them an item on your schedule with the knowledge they'll pick it up on theirs, and will follow up with you later. Imagine leaving the keys to your house under the doormat, then making a small chalk mark on the door to signal to your dog-sitter that the keys are there. No mark, no keys.
• Leaving a dead drop for yourself will make sure you always have a cache of something where you might need it. But this I would probably label as a cache.
A dead drop found by the person it's intended for is valuable. To anyone else, it's either trash or a dangerous unattended package, so tread wisely here. Don't do anything stupid or dangerous, like leaving your drop outside an airport or police station. Even Geocachers have guidelines about where they're comfortable leaving caches so they don't get confiscated, destroyed, or stolen.
To that point, here are some tips to make sure your drop never gets found-except by the person you want to find it:
• Make sure you agree on a "the drop is here" signal. If you're leaving a key for a spouse or pet sitter, for example, you want to make sure you give them a clue that the item they want is actually there. Aldrich Ames, a CIA agent convicted of spying for Russia in 1993, used chalk marks on mail boxes to signal his handlers that he had left them something to pick up. Your signal could be a chalk mark, or even an post-it note in the corner of a window, or some other visual cue that's only meaningful to you and the other person. Whatever the signal that your drop is ready is, make sure you and the person picking up your drop know and agree on it, and that it's something that would never arouse suspicion from anyone else (like a huge arrow pointing at the drop.)
• Make sure your drop isn't so obvious that it attracts attention. The key example is a good one, but under the doormat? That's for amateurs. Want to leave your password for the IT admin who helps you out in your office? If it's in any of these places, you're doing it wrong. Instead, pick somewhere few people would look for that specific thing. That doesn't mean bury the key in the yard (although that's not a bad idea), but put it somewhere no one would look for a key, like in an empty soda can behind a bush next to the side door. Leave your emergency go-bag next to the coat rack in your office, where a bag wouldn't be out of place. The best dead drops are often in plain sight, but no one thinks they're noteworthy. Alternatively, you could go all out and hide your drop in a hollowed out book, behind a brick in the wall, or even an inconspicuous soup can next to the trash or on the side of the road.
• Consider how quickly your drop will be retrieved. If you need to leave a note for someone and you know they'll be there to pick it up shortly after you leave it, consider putting it somewhere high-risk but quickly retrieved. Think scavenger hunt: I can leave a note with the clue to the next step of the hunt in a specific book at the library. If I know my contact will show up at 11am to pick up the drop, I can put the note in the book at 10:45 and walk away. My contact gets the drop and neither of us have to know the other's identity. Of course, the longer you wait, the more likely someone will check out your book!
• Like we mentioned, the best drops are the ones that are in plain sight, or are only easy to find by someone who knows the signal and knows the hiding place. If you've ever been geocaching, the specific GPS coordinates of the cache and a few simple clues are used to lead you to the cache. Every cache I've found has been somewhere plain and public, where someone could find them if they knew where to look—it's just that most people don't think to look under that park bench and open the Altoids tin taped to the underside, or think much of the plastic grocery bag that's stuffed into a space between two brick buildings.
• Geocachers leave and hunt dead drops for fun and thrills, but you can do the same to leave an item for someone that they need to get, but that you can't be there to give them. Just borrow a few tricks from the spy's playbook and you'll be a master at covertly, discreetly leaving packages for the right people to find.
Dead drops are a skill that could be handy in a without-rule-of-law situation. Like any other skill practice to ensure your system and spot work.
Semper Paratus
Check 6
Burn
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