20+ years ago in my area a deputy on a lonely road called in that he’d been shot by a pair of hispanics in a dark sedan.
A massive LEO response followed. A day later the investigators determined the deputy accidentally shot himself and made up the whole incident.
There was also a case in Arizona where a deputy claimed to have been in a firefight with a drug cartel out in the desert. After defending him for a while, they fired him when his stories got more and more wild.