The man, named as 41-year-old Tyrel Martin Marhanka, is thought to have hidden the dismantled scissors inside a magazine to get past a metal detecting door, Changhua district court said.
The court vowed to beef up its security control by adding two X-ray scanners when it moves to a new building.
There is not enough room for the scanners at its current facility, it said.
When the judge handed down a four-year prison sentence for smuggling poppy and marijuana seeds and for growing marijuana, Marhanka stabbed himself in the neck before bailiffs could stop him.
"We deeply regret that Tyrel Martin Marhanka killed himself during the sentencing," the court said in a statement.
"He was cooperative during the investigation and the trial. His attitude was mild and he did not show any signs that he would commit suicide."
Marhanka was married to a Taiwanese woman with two children and had been living on the island for many years, according to the court.
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