DANVILLE — A voter initiative spurred by the drunk-driving deaths of two Danville siblings in 2003 has garnered enough signatures to qualify for the November ballot, the Secretary of State's office said Thursday.

The Troy and Alana Pack Act, named for the son and daughter of Bob and Carmen Pack, would require random drug and alcohol testing of doctors and raise a $250,000 cap on pain and suffering damages victims can win in medical negligence lawsuits.

The measure would also mandate doctors consult the state's Controlled Substance Utilization Review and Evaluation System (CURES) — an electronic prescription drug database Bob Pack developed — before prescribing certain narcotics.

"The patient safety protections in this ballot measure will save lives and protect families from dangerous, impaired and drug-dealing doctors," Bob Pack said in a news release. "Today, California voters have taken the first step in making sure that more families like mine don't have to experience the pain of losing a child due to dangerous medicine."

Troy and Alana, aged 10 and 7 respectively, were killed when they were struck while crossing a Danville street by a drunk and heavily-medicated driver. The driver, a nanny named Jimena Barreto, was later found to have been "doctor shopping" for prescription pills from several Walnut Creek physicians. A jury convicted Barreto of murder, and she was sentenced to 30 years to life.

The initiative needed 504,760 valid petition signatures to qualify for the Nov. 4 ballot. Supporters turned in more than 840,000.

Contact Jeremy Thomas at 925-847-2184. Follow him at Twitter.com/jet_bang.