I could see many departments, and have heard first hand from the former YPD chief that he hates scanners, and wishes for encryption. Incidences like these will only further push other departments to enable encryption when they switch over to the MPSCS if they haven't done so already. Though, budget issues might be the final say in all of that.
The Ypsilanti Police Dept. (YPD) started using single-phase inversion voice scramblers (encryption) in the late 1960s. Their detective and tactical units were the first to make use of this technology in Washtenaw County. Later on, starting around 1970, the EMU Police Dept. upgraded their entire radio system, and voice inversion scrambling was procured. Finally, in 1972, when the new dispatch center was installed, all of the YPD patrol cars and their new main radio console had the ability to use this simple form of encryption.
The reason behind the full-scale implementation of voice privacy technology, was that the criminal element in Ypsilanti, was able to monitor their radio communications and avoid capture. Secondly, to keep the news media from showing up at critical incidents. Thirdly, as a countermeasure to the organizers of campus protests and riots, who were using police band radio receivers in the late 1960s and into the 1970s.
In 1981, the YPD patrol car radios were upgraded from the old single channel MOCOM 70 models, to a new four channel units that were black in color. Likewise, they also contained the ability to use voice inversion scrambling. However, the big change occurred in 1986 when the new Centracom II console was ordered, it only had the capability to use encryption on 155.130 MHz, their main dispatch channel. Moreover, there was a policy change at the same time to use encryption less frequently than in the past. This was because several city council members had scanners, but could not listen in when they went "Code 7."
The current YPD Channel #2 is supposed to be encrypted, but due to severe audio problems, they no longer use this function. Conversely, this may change when the new digital system is installed. All of the new radios are upgradable to encryption if needed by each department. However, the bottom line is cost, and will each agency spend the money to do so?
73s
Ron