California declares war on ‘ghost guns’ (msn.com)
“When we see an increase in homicides here, and when we see that the (police) report that 40 percent of the crime guns recovered are ghost guns …”
I find the statement above extracted from the linked article extremely impossible to believe - especially with no substantiating data to back it up 
In the absence of facts desired to support the narrative you wish to advance, it becomes necessary to supply your own.
guessing filed off s/n’s account for some of the paranormal activity…
Who you gonna call? Ghost Busters…
Who resurrected Kevin de Leon’s political career? 
Just because the serial number was ground off doesn’t make it a ghost gun.
40%? I would like to see his proof. That sounds completely ridiculous.