Anyone know how to defeat them? I have some ideas will test and then post results, well idea. Cutting the cord cuases a tamper alert.

I know a lot of the spy hobbyists have been going on about them forever. With all the systems out there you would have to know what your up against to defeat them properly.

if theyre just motion activated lights sometimes hugging the wall and walking below the sensor works

I did a little test and it seemed to give some results. Lets start this way, first there are two types of motion detector active and passive. An active motion detector is one that once tripped immediately sounds an alarm, a passive motion detector is one that is wired into a graphical alarm system. Assuming your target has a passive system going, the detector can be defeated simply, assuming you don't have uber guard/ cop on site. However depending on what target you are attempting to infiltrate, a little prep can also help defeat an active motion detector. Now I tested this system on an active motion detector, and all I did was cover the actual unit with a piece of paper, I then armed the system and was able to walk around the area without setting it off. I will attempt to try this on a graphical system given the opportunity, but there is know reason it shouldn't also work on a passive system. The hope one would have in dealing with a passive system, that being what is mostly used on patrolled sites, is that you could cover the detector setting it off only once, that way whom ever is monitoring will think it is only a rat or other small furry animal and not investigate. This system dose of course not defeat the detector completely but it will at least cover any further movements you make. I only did this one little test so of course it is not gospel, but it did seem give the results I hoped for. I will attempt further tests and see what I can come up with. Any further info anyone has is welcome. Please use this info for good not evil. T.L.

I doubt anyone on this board will ever end up dealing with this, but in the spirit of conversation/semi-spy I remembered something.

Most banks have 4 lays of security.

Camera's
Motion Detectors
Thermal Detectors
and ultra sonic detectors.

Given the sub catagories that have been already written down I assume on motion alone it could be a big issue.

If you're heading to an inactive site that has an alarm that reports to a central station, the best idea may be to disconnect the phone line to the building. It probably has an audible alarm too though, but at least the cops/security won't be directly notified. Of course, there is always a chance that they have a cellular backup.....

Most halfway decent motion detectors go off based on surface coverage of the movement so a rat would not set it off. It's also worth noting that many can be set to go off at one movement or two.

Good info, Thanks.

Just run in waving your arms and then hide in a shadow. Wait till security shows up, then leaves and do it again until they just ignore it. Preferably in regular intervals.


That or just run.

Constructive comments please, I dont want to end up like the rest of the forum.

I was serious.


If you trip it enough and they never catch you, they'll prolly think its a malfunction. Usuall the security guards arent the ones who set the system up and don't know how to tell if the system is messed up.

Exploit their ignorance.

Thats true but if they go off you have to go back, over and over as a security guard that is. Then there is the problem of a random search busting you in the ass.

I am of the understanding that active and passive refers to the types of alarm sensors and how they sense motion. An active alarm could be an Infra Red beam that is transmitted from a transmitter to a reflector or receiver (I would love to find a way to view these IR beams), while a passive system could be PIR (passive Infra-red) or ultrasonic that sends out a cone shaped beam of energy and triggers an alarm should a heat source or motion cause the beam to change when it is received. It is very difficult to move slowly enough to bypass an alarm and they are more often than not located so that you cannot walk underneath of them before it has sensed your presence (regardless of what you see on TV).
Therefore you have two options: 1) Cause the alarm and then provide a reason for the responding guard / police to believe that the alarm was caused by the movement of a cat,rat,bat,bird,ballon,etc that you leave in the area and that the guard believes caused the alarm (this is assumeing that the area is not covered by a camera) or 2)Damage the alarm itself by cutting wires, phone cords, setting up cellular transmission blockers (these do exist and are often used in opera halls), hitting it with paintball/ pellet guns etc.
I like the idea of using the paper over the alarm sensor's window but what I would do is buy a PIR alarm at Radio Shack and remove the plexiglass window. I would then cover this window on the back with paper, tinfoil, white paint and apply an adhesive. Now, approach the alarm in question, place your modified window over the alarm sensor's window and it will not stand out as being tampered with. It will appear to be a alarm sensor window , not a blocked sensor window.
Good Luck.
HAMMER

Certainly are a thorn in any infiltration. Something that happened to me recently while doing an inf. I was very careful while moving around, finally in the last place you would expect, I tripped one. What tipped me off was the phone rang, I was thinking who would be calling this place at this time? then I spotted that nasty winking red eye and departed rather quickly. So if you do trip one and there is an active phone expect a call first and take that as your cue to leave. This one was also no security alarm response but police so also be aware of that as being a possibility with the response. T.L.

Posted by FoxTwoFoxTwo I was serious. If you trip it enough and they never catch you, they'll prolly think its a malfunction. Usuall the security guards arent the ones who set the system up and don't know how to tell if the system is messed up. Exploit their ignorance.

that's stupid.
one needs to set his priorities, though, and this would work as a last ditch, low gain, high risk, and high maintenence effort.

Is it possible, if you have access to the wire that the motion sensor is connected to, to strip the wires with say, a razor blade, than short them by laying or wrapping some wire around the now exposed portions of the negative and positive wires going to the detector? Obviously there is a safety issue stripping live wires and there are obvious ethical questions raised by this, but theoretically, it would work, right?

Edit: I thought about this a little, and doing this might set off the alarm because the system might be able to detect a change in the current and be able to tell the motion detector was tampered with. However, if you were to bring an assortment of capacitors and a multimeter, wouldn't it be possible to find a capacitor to use when shorting the detector that would make the current the exact same with or without the short? (sorry, that last part was worded a little inefficiently)

Typically they have resistors in them, and you would need to determine the resistance, and replace with a resistor of the right value. I'm not quite sure how to do this without causing a brief interruption, but in theory it would work.

And with the volts/amps we are discussing here, you don't have to worry about safety. Unless it starts throwing sparks at, say, piles of chemicals, but it shouldn't.

Posted by Chronos Is it possible, if you have access to the wire that the motion sensor is connected to, to strip the wires with say, a razor blade, than short them by laying or wrapping some wire around the now exposed portions of the negative and positive wires going to the detector? Obviously there is a safety issue stripping live wires and there are obvious ethical questions raised by this, but theoretically, it would work, right? Edit: I thought about this a little, and doing this might set off the alarm because the system might be able to detect a change in the current and be able to tell the motion detector was tampered with. However, if you were to bring an assortment of capacitors and a multimeter, wouldn't it be possible to find a capacitor to use when shorting the detector that would make the current the exact same with or without the short? (sorry, that last part was worded a little inefficiently)

i've been wondering about this for awhile myself, and you would also need to know the system well enough, not only for the capacitors and resistors, but to know whether the system was an open or closed type.

Sounds like you would set off a tamper alarm, and how would you get so close without tripping it first. I guess if you were there when it wasn't active you could do all that, but then what would be the point.

I was thinking specifically of a building that I can get above the motion sensors (above the ceiling, via a maintenance room) but the motion sensors make it so I can't walk through a hallway. I've seen the wires that go to them and I know somone who cut them one time (what a moron). Are you sure that would set off a tamper alarm? I'm thinking about stripping the wires that go to it and laying across a resistor that matches the total resistence of the motion detector. It seems like I may be overlooking something though.