State drug testing laws create a patchwork of employer requirements that vary significantly across jurisdictions. Some states (e.g., Florida, Georgia, Alabama) offer workers' compensation premium discounts for employers with certified drug-free workplace programs. Other states restrict when testing can occur — limiting it to pre-employment, post-accident, or reasonable suspicion — and require specific notice periods, written policies, or confirmatory testing before adverse action. Marijuana legalization (medical and/or recreational) adds complexity: while some states protect off-duty use, DOT-regulated testing still applies regardless of state law. Employers must maintain policies that comply with both federal (DOT/OSHA) requirements and applicable state-specific regulations.