Maybe due to social and cultural factors, crimes going underreported, and biological factors. Also taking the crime itself into consideration may also play a factor.
1. Fingerprints, Video surveillance and neighbors that witnessed the burglary.
2. bullet casings video street evidence witnesses on the scene.
3. DNA of any kind ,notes, receipts The product that they made and it's consistency to match to what is found on the streets being sold.
Yes it had been for a while but people choose not to wear them even though there is a pandemic.
Hm yes I agree very good point
