(a) Definition of stock. "Stock" as used in these sections means dangerous drugs or controlled substances which are packaged in the original manufacturer's container.(b) Disposal of stock dangerous drugs. A pharmacist, licensed by the board, is authorized to destroy stock dangerous drugs owned by a licensed pharmacy if such dangerous drugs are destroyed in a manner to render the drugs unfit for human consumption and disposed of in compliance with all applicable state and federal requirements.(c) Disposal of stock controlled substances. A pharmacist, licensed by the board, shall dispose of stock controlled substances owned by a licensed pharmacy in accordance with procedures authorized by the Federal and Texas Controlled Substances Acts and sections adopted pursuant to such Acts.