IMPORTANT: Microwave Zapping Rules.
Don't leave it in the Microwave too long or the damage will be obvious. Too long and you'll not only have killed the electronics but the μWave will heat up plastics, paper--just about everything if the energy is concentrated enough.
1. μWave cookers of the ~700W variety take a finite time to get going--when switched on they sound as if they're working but they're not. It takes a few seconds for the filament in the magnetron to heat up (the filament emits electrons when hot). This is important for if this 'dead zone' time is added to the real zapping time it's possible you will overestimate the zapping time if you need to add a 'bit more' zap on the second time around.
For example, if the machine takes 3 seconds dead zone time and only 1 second zapping time you may think the zapping operations is 4 seconds when it in fact 1. If you double this false zapping time to 8 seconds you are in fact applying 5 times as much μW (1+4) and that'll be too much.
2. To well and truly fuck-up integrated circuits etc. you only need a second or two of μW at 700 watts. (But you do need to calibrate the effect with a similar sample beforehand--too much μW and the IC centres start popping out and things begin to smoke--you never need to go this far. Besides, going too far and it's bloody obvious to everyone you're the Smart Alec who made the mess.
3. Applying too much μW can be as little as 3 seconds zapping time (depending on what it is).
4. To test the dead zone time of an empty microwave place an old standard CD (commercial type with 'silvered' mirrored surface) onto the rotating platter and switch on. Start stopwatch simultaneously and watch for the moment the flashes start (as microwaves disintegrate the surface) then immediately stop the watch. Read off the dead zone time in seconds
5. Typical zapping time = dead zone time + 1 or 2 seconds.
6. Putting non-standard stuff in a μW can be dangerous (some things when heated produce lots of vapour and the object might shatter). As with anything that's heated sufficiently, combustion fumes will be given off and stink out the μW
7. WARNING! You may suffer considerable damage to your person when the head of the kitchen throws a rolling pin at you for having stunk out the μW.
8. Putting Government property into a μW is most likely unlawful. I'm not recommending that you break the law--check with your lawyer first.
9. Some things can be resilient. You must check RFIDs after zapping to ensure they're actually dead.
10. DO NOT DO THIS unless you are a professional nerd, techie experienced in such matters, or experienced pyromaniac. If you're not careful it's possible that you could have both the head of the kitchen and The State after your nuts. Not a bright idea!
11. There are similar examples of μW zapping on YouTube.
P.S. For the less adventurous. Wrap RFID devices in suitably shielded materials when you carry them around. The minimal amount of RF/EMR shielding should be determined empirically by checking it with an RFID reader (note not all RFID readers will be the same--some will be more sensitive than others). Shielding materials typically are metal boxes, metal foil, metal gauze etc. If you consider that protecting your ID is important then make sure that you fully test any RF/EMR screening system that you employ before you put it into service.