Hoby John Weldon, 25, was driving his Nissan pulsar when he was stopped by police for a random breath test on September 24 last year.

Weldon returned a negative alcohol reading, however was subjected to an oral drug test which returned positive to methamphetamine and THC.

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He was arrested and taken to Dubbo Police Station and asked if he had taken any illegal substances, which he told police "yeah".

In Dubbo Local Court on Wednesday, Weldon pleaded guilty to driving with an illicit drug in his system, second offence.

Defence lawyer Jacklyn Dougan-Jones said despite it being a second offence, asked the court for "leniency" as he had completed the merit program, and pleaded guilty at the earliest opportunity.

"His last offence was in 2018, it was an offence of a similar nature," she said.

"He states he's remained abstinent from methamphetamine since the start of that program, and to his credit has reduced his use of cannabis."

The court heard Weldon had missed one merit appointment, because he was attending TAFE to complete his Responsible Service of Alcohol and Responsible Conduct of Gambling certificates, as he had intended to get a job.

Magistrate Theresa Hamilton recognised he had taken some "positive steps" to address his drug habit and rehabilitate himself.

Weldon was convicted and fined $250. He was also disqualified from driving for six months.