I worked at Chicago Police Department full-time (More than 10 years)
Everyday is a different experience. Always something to learn. Always someone to help. Always something new to see. Never a dull moment.
The only cons are that some people don't like the police until they need you. But that is not reflective of how you perform your job.
I applied through other source. I interviewed at Chicago Police Department.
One achieves the rank of Detective by way of competitive exam and a prior history of exemplary work experience. There is, of course, a progression through the ranks and everyone starts out as a Probationary Police Officer before moving on to the status of Police Officer. All promotions accrue from that base.
There was no entry interview, as such, when I was hired. One applied for the job and then took an exam. I would recommend that applicants be educated and literate.
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