How are you defining "security experts"? Professional theives would have to know the panel's telephone number, unique CSID, and downloading code. They'd also have to know what kind of security system you have because one manufacturer's downloading software won't work with another.
As far as licensed security professionals go, it *is* possible to disable a system remotely but they wouldn't dream of doing something like that. We're in the business of *protecting* people. Your question is like asking a Police officer if he would ever rob a bank.
It depends on how ADT programmed the system. You can "quick arm" most controls without a code (that feature is activated by your installer). You will need the code to *disarm* the system. The installer code will
*not* disarm the system if it's armed with a regular user code on an Ademco, First Alert, or FBI panel with the exception of some of the smaller systems where the installer code is also the master code (Vista
10 for instance).
If it's programmed not to require a code to arm (called Quick Arm) you don't need a code to arm in Stay or Away modes. Normal?...dunno, personally I don't allow for Quick Arm too many false alarms from; kids pushing buttons, people moving into a new house and never bother to call us on how to use the system, and just plain idiots pushing buttons to see what they do.
The smaller Ademco panels won't display it. You'd need access to installer level programming to recover it on the bigger stuff and then you'd only be able to do that if the "view" feature was "enabled" in programming.
Yes. If you had access to installer level programming.
People "suffering" and "crooked" cops are two entirely separate issues.
It's far more likely that a thief would attempt to disable the system locally than try to hack it remotely. ADT uses a special version of the remote DLL software used to remotely program alarm panels. Occassionaly you'll see someone here ask for a copy and be told that there aren't any. AFAIK, there aren't any copies floating around out there and you can't reprogram an ADT panel remotely without it. I would be much more concerned with the possibility that the link to the monitoring center could be compromised. That's why the most secure systems like those that protect government secrets and bank vaults typically use some type of line security; a feature typically not found on run-of-the-mill alarm systems. At a minimum, you should at least use some type of wireless communications device as a communications back-up.
Line security means that the communications means is supervised. There are several ways to accomplish this included dedicated leased phone lines, two-way long range radio, and network-based communicators. If communication between the alarm panel and monitoring station is compromised, the monitoring station can dispatch the proper authorities. This is typically used in high risk applications like cash vaults and classified storage facilities.
While it may be possible to jam a cellular communicator, it is highly unlikely that someone could get to a properly installed and secured unit in time to physically disable without a great deal of prior knowledge.
I've had the opportunity to design systems that secure very sensitive facilities and I'm confident that when designed, installed, and operated properly; even an industry insider could not compromise them.. Some of the standards that apply to these designs are in the public domain. If you are interested in the way these facilities are secured google "DCID 6/9" and "NISPOM" and read the sections on intrusion detection systems (IDS). Remember that physical security is more important than alarms, and most of these manuals deal with that aspect.