So I got the Dear John letter from the Rock Hill SC Police Department should I stop considering a career in LE?

I work for a small southern town police department and have just isted our IA division with the selection process for rookie police officers. I don't think you should give up. There are national standards and prequalifications and then the department has their own set, so really you are ping two sets of prequalifications. It sounds like you are ping the initial ones so there shouldn't be a problem. There may have been someone who scored even one point higher on an exam than you did and they by law have to give that person the spot, or they may have a race/gender percentage that has to be filled and you may not fit that criteria. Your qualifications look exceptional and I think a department would be lucky to get you as an officer. Don't look at it like they didn't want you, think about and maybe you didn't want them. Make it your choice, not theirs. Good luck!