In regards to encrypted devices, the reports states: "The number of state wiretaps in which encryption was encountered decreased from 22 in 2014 to seven in 2015. In all of these wiretaps, officials were unable to decipher the plain text of the messages. Six federal wiretaps were reported as being encrypted in 2015, of which four could not be decrypted."

This is out of 2,745 state and 1,403 federal for a grand total of 4,148 wiretaps, an increase of 17 percent over 2014. So while surveillance increased, the amount of times law enforcement encountered encryption decreased.

Earlier this year the Department of Justice and FBI were locked in a court battle with Apple over an encrypted iPhone used by San Bernardino shooter Syed Rizwan Farook. The government eventually dropped the case after finding a third party to help it bypass the phone's security.

But it started a national debate about personal devices and encryption. Tech companies want their customers to be secure while law enforcement want backdoors or keys to encrypted devices for investigations. But it looks like when it comes to wiretaps, encryption isn't as big a problem as many would suspect.