What are /r/physec's favorite Products & Services?

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It's not a lock, but seems to confuse the hell out of your average adult as to how it opens. Especially if they're just reaching in and can't see it. Benefit is that it doesn't use any new screw holes and just slides in around the existing dead bolt.

https://www.amazon.com/Safety-1st-Secure-Mount-Deadbolt/dp/B00BBF7UVA

Depending on what kind of door it is (is it wood or steel?) you could mount a second deadbolt in the door further down, out of reach of the window. Drilling the new holes in the door would be the most difficult, if you don't have experience doing such a thing. You can get a jig kit to drill the holes.

As someone pointed out in another comment, you can rekey the new lock to match the old ones (make sure it's the same brand lock, so it uses the same type of key).

A double-keyed deadbolt is an option, but it might be against local code. This is never a great option as it also limits your options as far as operating the lock from the inside, you'll always need a key to get out. It's easy to assume you'll always have a key on hand, but in an emergency (i.e. in a fire) that might not be as easy as you assume (this is the typical justification for this type of lock being against code).

Another option, consider a swing bar guard and mount it low enough on the door to be out of reach.

I was interested and took a look at the amazon page for the textbook the Keyspecter recommended, and ended up finding another textbook recommended by Amazon that has building security, including turnstiles, lighting, signage, access control, surveillance, etc.

This is the clipboard I bought - I was basically just looking for the one that gave me a lot of volume to work with and 2 interior sections.

I have the Sparrows UDT and wanted to integrate it, but unfortunately it's too stiff to bend enough to fit. I can fold it into a loop but that isn't enough. The NotSoCivilEngineer mentioned that the Red Team Tools UDT is more flexible so I may try getting one of those to see if I can integrate it.

Oh, while I remember, I had an idea for a different space-efficient UDT and wanted to share it with you since you have done a lot with UDTs.

I saw your video of the take-down UDT made with threaded rod and thought of a different way to make a take-down UDT - make it like one of those collapsible walking canes for the blind: comparable example.

The tool body could be made of a set of interlocking hollow-core metal (or maybe high-strength plastic?) tubes with a length of shock-cord in the center under tension to quickly snap them together into the full-length shape.

Much faster to deploy and take down, and the shock-cord would keep everything as a single unit even while in broken-down configuration.

Edit: the primary challenge that I see with materials is to have something both thin enough to work and fit under the door but still strong enough to not overly bend or snap during operation.

pretty sure that is just a key with thumb turn on it - looks like this https://www.amazon.com/Thumb-Turn-Key-POLISHED-BRASS/dp/B012YJPYH8 . We use double cylinder locks and obviously that's a nono for fire code so we pop these in for fire mashall inspections.