On top of this, the FBI doesn't have a "going dark" problem. For more on this please read Trevor Timm (an activist for the EFF and Executive Director of the Freedom of the Press Foundation) on the topic here: http://dprogram.net/2013/04/17/going-dark-whats-so-wrong-wit...
"Trevor Timm: Well, yeah. They’ve been complaining about this “Going Dark” problem for years now and we’ve never really seen any actual evidence that this actually exists. The FBI or the DOJ has to report the number of times they run into encryption when they ask for surveillance. Every year they have to report back how many times they ultimately couldn’t get the information they sought; the number is always 0—for the last 11 years."
"Trevor Timm: Well, yeah. They’ve been complaining about this “Going Dark” problem for years now and we’ve never really seen any actual evidence that this actually exists. The FBI or the DOJ has to report the number of times they run into encryption when they ask for surveillance. Every year they have to report back how many times they ultimately couldn’t get the information they sought; the number is always 0—for the last 11 years."
He shared this on twitter a while ago: https://twitter.com/trevortimm/status/331985318620327936