A police officer is treated as an expert witness in a courtroom. If it's just you and the police officer in that alley, the officer's word will be taken over yours. Officers have a strong incentive to lie about the incident since they will always be believed.
This was new to me and I'm not sure but I think I might have heard that it was because of some case in the 70ies or something.
I'm not arguing one way or the other whether escaping from prison should be criminalized. I'm just saying the stated argument is really bad.
Whether juries actually pay attention to this or not I cannot say.
I had the prosecuting lawyer explicitly ask us during jury selection if we would "take into account that police officers have training which [we] wouldn't have access to as a civilian." And repeated it during the trial. All without a peep from the judge. So YMMV on that.
On an unrelated note, the prosecuting lawyer then proceeded to systematically eliminate exclusively women and minorities from the jury, and specifically removed every woman of color. Which I'm sure was a total coincidence.
I am speaking for the United States.