The primitive lab for weapon-related activities would not be located in a city neighborhood (unless the neighborhood is suicidal - think spills and fume hood emissions). Alternatively, the lab would have to be equipped with exhaust fume hoods and glove boxes - both equipped with scrubbers. This kind of equipment, necessary to protect those working in the lab and their immediate neighbors, would be much more in the nature of evidence as to the lab activities than a photo of shelf full of chemicals with illegible labels.
You have abolutely NO idea about the motivations of these guys. They care NOTHING for the people in the neighborhoods et.al. This is an underground lab. Scrubbers....Jeez, I guess you think they get inspected for hazardous conditions or something....
Semper Intolerant