Dryfiring should only be conducted with a spent cartridge, snapcap, or other dummy round in the chamber. The inertia of the pin without a stop can damage the pin. Generally speaking, dry firing is considered very bad form. Dry firing without a live round, but something to absorb the inertia of the firing pin, is another matter. That is acceptable, and necessary for weapon familiarity. Nobody gets good with a weapon without extnesive presentation, and dry firing using a dummy round in the chamber (but using a snap cap is not the same as dry firing without a round or device in the chamber).
No matter if a round is in the chamber, every weapon should always be considered loaded. Certainly transporting a firearm and some conditions of use dictate an unloaded weapon. However, the firearm should always be regarded as loaded. Considering that weapons should always be regarded as loaded, I keep one or more weapons in my safe at home loaded for rapid response, and speed loaders and magazines prepared. Most remain unloaded to protect the springs, but an unloaded weapon is a wonderful conversation piece, but of little use beyond that.
IPSC is not the model for weapons handling, and never has been. It's not realistic; it's a game. IDPA started out as being closer to a proper model for handling, but has also become a game. Both are similiar to SASS and other CAS type sporting events. None truly reflect tactical training or range requirements, and the need to dry fire a weapon has never been reflected in range ettiquette. It's an organizational issue; some places you'll be banned from the range if you dry fire without something in the chamber.
Considering the Berretta was designed to be decocked with a round in the chamber, dropping the hammer using the decock is a traditional method of "safing" the weapon. I don't like to see a weapon dry fired. Having carried and qualified with the M9 (92FS), I prefer to drop the magazine, cycle the slide once, check the chamber by feel and visually, and then use my right hand to depress the trigger while lowerint he hammer between my left thumb and forefinger while grasping the slide in the left hand. While this is performed, the weapon remains downrange. There is NO question the weapon is unloaded and safe. Or "cold." To each his own; one must do what one is required by the respective organization, and if IDPA, a department, agency, battalion, or service requires firing in the red barrell, then so be it.
Departing the range , or entering the range, the weapon should be locked open with the magazine removed.
Incidentally, this site does allow you to send private mail. I get it all the time, and you can send it any time you like. It's a design feature of the site.
I don't personally know any agencies that endorse IPSC or IDPA. I once watched a Leatham film as part of a recurrent course on a department; it was personal property of the weapons training officer, and wasn't departmental policy. He made some comparisons between IPSC shooting and professional carriage, but it was liberally applied, and only to make a point. If individual team members and officers participate in IPSC, IDPA, or any other shooting sports, it's on an individual basis. IPSC doesn't represent the standard for any department in handling. Some may use similiar techniques, but that's only because the techniques make sense, not because they're any more enlightened than the rest of us.
I don't wish to discuss firearms safety on this site any further, as it's far from the intent of the site. The origional point of the thread was simply to refer the viewer to an article about airport securitity, one of whom shot himself. If a further discussion of manual of arms, range ettiquette, or other such topics is in order, please contact me by private message. I'll be happy to elaborate there.