Step 1: Understanding the role.
The person in charge of state drug laboratories is responsible for overseeing the testing and regulation of drugs. The role typically includes ensuring compliance with drug regulations, testing the quality of pharmaceutical products, and maintaining laboratory standards.
Step 2: Analyzing the options.
(A) Drug inspector: Drug inspectors typically monitor and enforce drug laws but are not necessarily in charge of laboratories.
(B) Chemical examiner: A chemical examiner is responsible for analyzing substances but does not oversee the entire laboratory.
(C) Govt analyst: Government analysts conduct tests but are not the heads of laboratories.
(D) Drugs controller: Correct — The drugs controller is responsible for managing and supervising drug laboratories at the state level.
Step 3: Conclusion.
The correct answer is (D) Drugs controller as this person oversees drug laboratories at the state level.