A baby-faced drug pusher who continued to traffic drugs while behind bars has been jailed for nine years.
Aaron Richard Cowell sobbed in the dock of the Brisbane Supreme Court on Thursday as his sentence was handed down.
Justice Martin Burns said even though he had turned his life around while on bail, his criminal behaviour warranted a lengthy jail term.
The court heard the 25-year-old netted more than $100,000 over just seven months in 2015 and 2016 through the sale of wholesale quantities of drugs, including ice, cocaine, MDMA and cannabis.
Police also located up to $200,000 worth of drugs during searches of his north Brisbane home, car and buried in a box at an associate's property.
Justice Burns said Cowell's drug trafficking revealed a "disturbing level of sophistication".
"The use of an ultraviolet pen to hide your records is perhaps the most prominent of those features," he said.
The court heard he used it to write tick sheets of what was owed to him by customers on walls inside his home to avoid detection.
Justice Burns said he also continued to deal large quantities of drugs after he came to the attention of police.
"You even continued your offending from your prison cell," he said, although he conceded Cowell was prevailed upon by other inmates to get his then-girlfriend to continue his work.
Cowell's defence team said his client became addicted to ice following the breakdown of a relationship and his partner's miscarriage.
The court heard he may have also used it to "self medicate" for mental health issues.
Justice Burns said it was clear Cowell's life had been devastated by his own actions.
"What you were doing was peddling this same drug that devastated you and your family, to countless families within the community," he said.
Cowell was sentenced to nine years' jail for the single count of drug trafficking, but will be eligible for parole in May 2020.