Sounds like Zwink's opinion makes an appeal likely. Obviously, investigations should follow the evidence wherever it leads. 
The current Houston fireworks businesses have strong, right-wing political connections. Soon after the Miller's Reach Fire's millions in damages and untold personal losses, the borough discussed a borough-wide ban on fireworks. The meeting was uniquely staged in Big Lake rather than Palmer. Fireworks stand owners (at that time there were three separate proprietors) personally called and leaned on every person they ever helped with a favor to show up and support them. At the meeting the measure failed. 
The fireworks business in Houston appears to have extraordinary political protection.
It never fails that even at my post-Miller's Reach Fire home in Wasilla, I'm still stuck hearing fireworks in my neighborhood and a few years back needed to clear giant bottle rockets from my roof and yard.