Charlie Key, 19, was snared as part of Operation Doon, which is an investigation seeking to weed out drug dealers.
As part of the operation, undercover officers test purchase class A substances in order to catch out street dealers in the act.
Prosecuting barrister Richard Thompson told Hull Crown Court : “The defendant on three occasions supplied heroin. “On November 27 he supplied both heroin and crack cocaine.
“That activity was captured on a covert camera and stills were taken of this defendant who was identified as the person being involved in these transactions.”
A search warrant was carried out at Key’s home at James Reckitt Avenue the following April.
In his bedroom, police found £100 in cash in a rucksack and a further £300 in a cup on top of a wardrobe.
Fourteen wraps of cocaine were found in two containers and another container included four wraps of heroin within.
A set of scales with a trace of a white substance upon it was also found.
“Two mobile phones were seized,” said Mr Thompson. “A list of telephone numbers was recovered from the top of the cupboard.
“The defendant was arrested and gave no comment when interviewed but did say he saved the £400 for the birth of his son.
“A phone was examined which contained drug supplying messages. The contacts list in the phone matched the list of 30 numbers on the paper.
“In addition, the phone contained messages evidencing the defendants involvement in managing other drug dealers.”
Key appeared at Hull Crown Court on July 5 to be sentenced for six drug offences as well as possession of criminal property.
In mitigating, Catherine Kioko-Gilligan told the court Key was “coerced” into supplying drugs after he became unable to fund his own habit.
“He has let down his mum and step-father,” she said. “The defendant has a partner of 14 months and they have a new son, a new baby. He is hoping they can live together and put all of this behind him.
“He tells me he is drug free and that he intends to remain that way. He is a young man and this has been a wake-up call for him.”
Judge Bury added: “You missed the birth of your child. If that is not a wake-up call then I don’t know what will be.
“You indicate you are drug free and want to stay that way. References say you are a young man who has got potential, both in terms of work and family, and that you are actually a decent young man.
“You have to be punished for your offending. You have the good fortune of knowing you are still a young man who has his life in front of him.
“When you are serving out this sentence reflect on it Mr Key.”
Judge Bury sentenced Key to three years inside a young offenders institute.
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