Title 21 CFR sections 1301.72 through 1301.76 set the DEA physical-security requirements for storing Schedule III through V controlled substances. Woven wire partition cages are a common choice for pharmacies, medical facilities, pharmaceutical companies, distribution centers, and drug warehouses, and whether a cage satisfies the rules depends on how it is specified and installed.
Every DEA cage is built to the same specification: self-closing, self-locking doors, 10-gauge 2 inch by 1 inch wire mesh on both walls and ceiling, and heavy-duty hardware that cannot be reached from outside the enclosure.