Pursue a masters degree or get a second bachelors?

Unless you want to go in a completely different direction than Criminal Justice, I recommend going for the graduate degree. Go up, not lateral.

I wouldn't waste your time with a second bachelors degree unless it is in a significantly different area. Even then, in most cases, your masters does not have to be in a field even closely related to bachelors so it doesn't matter. Also, doctorates are of less value outside of teaching and research than you might think so multiple masters degrees are probably more valuable to the average person. Just my two cents based on my experience.

I actually debated this recently. I was a "few" classes from a second BS (like 5~). But I decided that working towards the MS would likely benefit me more in the long run. It's not that the additional BS would hurt, but why burn limited resources unless it would give me a VERY clear advantage. The MS is a solid step up. The BS is a lateral.

My wife however decided to pursue a second (&3rd) MS degree however rather than a doctorate. The two programs she was looking at had significant overlap, and were in line with opportunities she was already pursuing so although it was a lateral move, it was still a clear advantage, and doubling up on resources (time & money).