Assertion: opium's use | /r/HasSubevent | clandestine laboratory fires
Facets:
value: often
type: TEMPORAL
Source sentences:
text: "Further contributing to the threat posed by the trafficking and abuse of methamphetamine, some chemicals used to produce methamphetamine are flammable, and improper storage, use, or disposal of such chemicals often leads to clandestine laboratory fires and explosions.