SAN LUIS OBISPO, Calif. -

The man charged with DUI-related crimes in the death of a Los Osos teenager was in court for the first time since the deadly accident. Today, his attorney spoke out, claiming his client is innocent of those charges.

Attorney Darryl Genis says Alexander Gonzales is innocent of the DUI-related crimes that the District Attorney's Office is charging him with. His next move is to challenge those charges in court.

Gonzales’ arraignment comes 5 days after he was involved in a head-on collision in Los Osos that killed 18-year old Jackson Garland, a recent San Luis Obispo High School graduate.

Gonzales was arrested and charged with DUI and gross vehicular manslaughter while intoxicated.

"There was a breath test given at the scene, and it showed that there was no alcohol present in my client’s system," said Genis. "So we know he wasn’t driving under the influence of alcohol."

CHP officers told us last week that they believe Gonzales was under the influence of drugs, not alcohol. But Genis tells us that the DUI charges were made before any blood test results were released.

"At this point I still haven’t seen any toxicology reports showing presence of any drugs that would’ve caused this accident," said Genis. "And so I'm left wondering if this was an accident or one or more motorists did something wrong. Or if there is something more to it."

Genis says that Gonzales plans to plead not guilty. The plea was delayed Monday and instead a motion filed to challenge the DUI charge. We reached out to the San Luis Obispo County District Attorney’s Office for comment on the case, but did not hear back.

Gonzales, meanwhile, is due back in court on July 7th to challenge the DUI charge in addition to a bail reduction hearing. His bail is set at $130,000.