HHmmmm. If this is real, then it's pretty sad. I'm not convinced that it is, though. It could be, but maybe not. First of all, the website says that this guy is a DEA officer. If you look very closely when he turns, the last two letters on the back of his shirt say "SA". This could be NSA or TSA or whatever, but I don't think these two agencies normally have "POLICE" on the front of their shirts. Maybe, but I don't think so.
Second of all, this guy refers to that particular handgun as a "Glock 40". There is no "Glock 40". There are .40 caliber Glocks, such as the Glock 22, 23, 24, 27, and 35. Most people don't call these "Glock 40's". They call them "Glock 22", "Glock 24", etc. But, of course, most federal agents don't shoot themselves in the leg either, or bring loaded weapons for demonstration in to what appears to be a school classroom, or talk like complete idiots, like this guy. Of course, this is the government we're talking about, so it could be true.