FRESNO, Calif. (KFSN) --Authorities say they're seeing an increase in liquid methamphetamine being smuggled into the Valley.
This is video from a recent bust in Madera where federal agents discovered an elaborate drug storage and processing lab.
They also found about a million dollars' worth of crystal meth, which they believe was brought into the country from Mexico as a liquid.
It's commonly disguised in tequila bottles or even detergent containers to trick border patrol agents.
The homeland security investigations branch in Fresno has seized more than 600 pounds of meth recently converted from liquid form in about the last six months. Authorities say the conversion process is extremely flammable, which puts neighbors at risk.
Mike Prado with Homeland Security Investigations in Fresno said, "Historically these conversion labs were in rural areas, but now they're in densely populated neighborhoods right here in Fresno and surrounding communities of the Central Valley."
Investigators say residents should report any suspicious activity to police or deputies.
That includes any strange chemical odors that may smell like paint thinner or nail polish remover.