A DRUG addict turned up at Toowoomba Police Station to file a complaint about the poor quality of amphetamines he had just bought from a street dealer, the city's Magistrates Court heard.

Geoffrey Michael Pearce, 30, told officers he had received $100 from a city charity to get him through the Christmas break last year, $90 of which he had spent on a bag of amphetamines.

However, an obviously drug affected Pearce complained about the drug's inferior quality which he admitted to having injected, police prosecutor Greg McIntyre told the court.

Police confiscated the small plastic bag he had with remnants of crystals and arrested Pearce, the court heard.

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His solicitor Joe Millican submitted his client had shown "extraordinary co-operation with police" and had he not attended the police station the offence would have gone undetected.

Pearce pleaded guilty to possessing a dangerous drug.

Mr Millican said his client had since voluntarily entered into rehabilitation with Teen Challenge where he would remain for the next 12 months.

His client was on a disability support pension because of depression, a condition made worse by his drug use, he said.

Pearce also pleaded guilty to sending a series of menacing text messages to two women he did not know, and to driving an unregistered, uninsured car while his driver's licence was suspended on December 15.

Magistrate Bruce Schemioneck ordered Pearce do 80 hours community service, placed him on a 12-month good behaviour bond, and disqualified him from driving for two years.