OK, you understood ‘cops’ that is not a expression we generally use here in the UK. We Brits traditionally often refer, respectfully, to our ‘boys in blue’ as ‘bobbies’ or ‘the old bill’.
Anyhow, given that, I am likely to presume that you’re asking about the United states police force and their longstanding joint venture with the Motorola Business. OK, here goes…
According to Motorola’s own website,
Motorola manufactured vehicle radios as early on as the 1920’s and US police and the fire brigade used a few of these, but it really was not until 1930 that the initial police force car two way radio was developed and constructed by Motorola. In line with the official internet site,
In 1936, the Motorola Police force Cruiser Radio was released. It was a success and Motorola have been a trusted brand name by US Law enforcement since. In 1939, engineer Don Mitchell created the Mobile T6920 AM Transmitter. It was another achievement, becoming a commonsense choice for that law enforcement as,
Noticeably, the US police force use a long and abundant connection with the Motorola Company. This evidently applies to walkie-talkies also. It makes good sense to employ a trusted, easy to implement product for successive generations of officers, who often have to respond promptly and impulsively to various troubles.
The very first police to utilize two way radios were in fact Australian, but following the Second World War, mobile radios were to become standard issue in the majority first world states.