I believe "Mete" may be referring to the Gary Fadden incident. The article below provides a good account of the legal ramifications that Fadden faced in the wake of his lawful use of an automatic rifle in self defence.
Anytime the prosecution and the judge are unscrupulous, the law abiding defendent is going to be in trouble regardless of the weaponry use. It can and has happened with everything from Saturday Night Specials to hunting rifles, .22 lr to military and buffalo cartridges. The problem with the Fadden incident wasn't that the weapon was full auto, but that both the prosecution and the judge were highly biased apriori.
As a side note, Fadden and his significant other would likely be dead now if not for the use of the best only only firearm he had at his immediate disposal.