We've talked about StingRays before. These are mobile cellphone towers law enforcement can use to track what cellphones, and cellphone owners, are in the area. They're scary, but the good news is that law enforcement now needs a warrant to use them.
There are a few exceptions, however. The FBI, for example, doesn't need a warrant if there's probable cause and no time to get a warrant, say in the case of a kidnapping. Now it turns out one government agency doesn't need a warrant for another reason.
The Secret Service is allowed to deploy StingRays when there's a threat to the president or other person under the Secret Service's protection. For example, if someone from a certain city made a threat about a government official, a StingRay could be used at a speech in that city to detect the person who made the threat entering the area.
According to NBC News, Homeland Security Assistant Secretary Seth M. Stodder says that the Secret Service won't be using StingRays during investigations related to counterfeiting or other U.S. Treasury tasks.
Let us know your thoughts on StingRays, and whether these exceptions made sense, in the comments.