CA AB2740

Establishes 5 ng/ml or more of delta 9-tetrahydrocannabinol (THC) in blood as the legal standard for driving under the influence, creating a rebuttable presumption if a chemical test within 2 hours of driving shows this level.

Requires corroborating evidence independent of the blood test for conviction, including physical or mental signs of impairment, field sobriety test results, unsafe driving, or witness testimony about the driver's condition.

Applies the same THC standard to driving under the combined influence of alcohol and drugs, and to causing bodily injury while driving with elevated THC levels.

Makes technical amendments to existing alcohol-related driving offenses in Vehicle Code sections 23152 and 23153 by renumbering subsections for clarity.

Specifies that no state reimbursement is required for local agencies because the bill creates a new crime or changes crime definitions under Government Code section 17556.