A good TV cop would be able to figure out who manufactured the signs by finding companies in the area who produce them, and then running metal tests against their stock, or pressuring them to divulge their client. Personally, I like the Raymon Redington approach, and just torture them.
A good TV cop would be able to figure out who manufactured the signs by finding companies in the area who produce them, and then running metal tests against their stock, or pressuring them to divulge their client. Personally, I like the Raymon Redington approach, and just torture them.
With the internet, likely not done locally.
Probably, but this is a pretty specific attack. It might be worth looking at sign shops along the bus route. It could be one of their employees.
Edit: here is one near the bus route:
https://signarama.com/categories/wayfinding-safety
Not making any accusations, but they have the materials and machines.