A Rocherlea woman who was sentenced to a 12-month home detention order in December failed all 10 drug tests when she could not stop using cannabis, the Supreme Court in Launceston heard.
Katrina Jane Cunningham, 37, received the detention order after pleading guilty to a vicious assault in April 2019.
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A condition of the order was that she not use illicit drugs.
After Cunningham failed the drug tests the Department of Community Corrections made an application to have the order cancelled.
Justice Robert Pearce sentenced Cunningham to five months jail from June 26, 2020, but suspended three months.
"I am satisfied both that you are not able to comply with the order," he said.
"You have continued to use cannabis not only in the face of the prohibition in the home detention order but knowing also the affect it may have on your ability to drive.
"Between the making of the order and a compliance report prepared on April 30, 2020, each of the 10 urine drug screening tests you undertook were positive to the presence of cannabis.
When Cunningham appeared in May 2020 Justice Pearce directed her to cease all use of illicit drugs.
"However you admitted using cannabis again and none of the five drug tests following your court appearance have been free of cannabis," he said.
"The result is that, since the home detention order was made, there has not been a single negative test."
He said she had complied with most of the conditions of the order which had enabled her to keep looking after her child.
"Your imprisonment will affect your child," he said.
"That is a direct result of your failure to comply with the terms of the order.
"It is yet to be determined whether foster care will be necessary or whether care arrangements can be made and approved between your parents and your partner. "
He said he took a lenient approach by suspending part of the jail term.