As of 2018 George Gloeckler is still not convinced the Voyager 1 spacecraft has left interstellar space. Even though the data he is reading does not support his claim, George remains resolute. George explains his position here.
The following is a speech George Gloeckler gave in Gottigen, Germany at the Max Planck institute in 2016. The speech explains the controversial theory that George and Len Fisk have as it relates to Voyager 1 NOT yet having crossed into the interstellar medium.