Warrick William Dunn, 57, was driving a black Holden ute when he was stopped by police on Wheelers Lane for random testing at about 12am on June 13 this year.

After returning a negative alcohol test, he was subjected to an oral fluid test, which returned a positive reading for methamphetamine.

He was arrested and taken back to Dubbo Police Station.

The next day, Dunn was again driving his black Holden ute when he was stopped by police on Erskine Street for random testing.

He tested positive for methamphetamine, and was placed under arrest.

On June 26 this year police stopped Dunn, who was driving along Macquarie Street for random testing, when he tested positive to methamphetamine.

The next month, on July 10 Dunn was again stopped by police while driving along Fitzroy Street at about 1pm, when he tested positive to methamphetamine.

He was arrested and taken to Dubbo Police Station, where in relation to the use of drugs, he told police he "swallowed some a couple of days ago".

Representing himself in Dubbo Local Court earlier this month, Dunn pleaded guilty to four counts of driving with an illicit drug present in his system.

Dunn requested the court adjourn the matter so he could complete the traffic offenders program and complete the court merit program.

However Magistrate Gary Wilson said that an adjournment was requested on September 22 to complete the traffic offenders program, which did not happen.

"Every time there's an excuse. These matters can't keep being rolled over, one day you've got to bite the bullet," Magistrate Wilson told Dunn.

Dunn explained he had just received a job, which required driving, and when asked about his drug use, told the court he was taking ice because he was "having a rough time for a while back".

The court heard Dunn had been convicted of the same offending previously, and also received a speeding fine.

However Magistrate Wilson adjourned the matter to allow Dunn to be assessed for the merit program, and complete the traffic offenders program.

"If you complete the merit program, that means 12 out of 12 appointments, you come back on December 8 and tell me you've been assessed as suitable to do the program, and also in the meantime complete the traffic offenders program, we'll see our way around this," he said.

"If you don't, you know what's going to happen. Do that and I'll keep my word."

The matter will return to court on December 8.