The news reports say the there were between 300 and 400 grams of PETN in the two bombs. That’s between 10.6 and 14.1 ounces. The reports also said that in both cases that was enough to bring down the airplanes. The underwear bomber had 80 grams (3 ounces) of the same explosive in his pants.

So, to show they are doing something (closing the barn door before more of the horses get loose) the TSA bans toner cartridges containing more than 16 ounces of “toner”. Okay, so what about 15 ounce cartridges which are more than the Yemen bombs? Why are they allowed? Makes no sense.