That's just 6 years ago so any one of the more popular music playing devices could have handled the job in a shirt pocket!
You ever take a good look at rap lyrics? Many of them are very violent. Your more serious minded cops probably aren't into that stuff and wouldn't recognize it if was pasted to the inside of their doughnut boxes!
We've been through this in this family with a younger cousin posting EMO song lyrics on a website. Ever read that EMO stuff? Some family members got very excited about them imagining they were original compositions and there was an immediate danger of suicide!!!!!
I try to stay up on this CR*P so I"ll know what it is when I see it. Sean Bell was probably killed by little understood pop culture. This young man was hauled off for 30 days observation most likely for the same reason. There are others who've suffered the same for the same reasons.