You have a citation for your interpretation of "rent-a-cop"? I am intrigued but cannot find any use of the phrase other than something to the effect of "wannabe

You have a citation for your interpretation of "rent-a-cop"? I am intrigued but cannot find any use of the phrase other than something to the effect of "wannabe cop". Even the 1987 movie by that name is a former cop who works private security (fair warning I have never heard of the movie until reading the wiki summary a few minutes ago).