Roger, aged 35, faced multiple drug-related charges in October 2022. The first charge involved the possession of cocaine, a Class A drug, with an estimated value of £2,500. The second charge pertained to possession with the intent to supply a Class B drug, ketamine, valued at £8,000. These substances were discovered by the police during a night time raid at Roger's residence while he was asleep. Following the advice of his legal counsel, Roger chose to remain silent during police questioning. In June 2023, at the Crown Court, Roger opted to plead guilty to both offenses. It is acknowledged that Roger had supplied small quantities of ketamine to his mentally disabled nephew, 15-year-old Peter. Roger admitted to providing Peter with ketamine on three occasions to alleviate severe anxiety and depression episodes. Roger asserted that he had been pressured by family members to procure and distribute the ketamine. No evidence suggests that Roger's possession of cocaine was for anything other than personal use. Roger has a prior conviction dating back to 2015 for possession of Class A drugs. A Pre-Sentence Report assessed Roger as having a medium risk of re-offending. In a letter addressed to the court, Roger acknowledged his struggle with drug addiction, revealing periods of abstinence interspersed with relapses. He expressed a sincere desire to overcome his addiction and rebuild his life, particularly since his partner is expecting their first child. Roger's stance on the ketamine issue remains somewhat ambiguous, as he told the Probation Officer that it genuinely helped Peter cope with anxiety and depression. The local church pastor, where Roger is a regular attendee, submitted a character reference highlighting Roger's past charitable contribution. A psychiatric assessment indicated that Roger faces challenges with structure and has a mild form of ADHD. Despite his current unemployment status, Roger disclosed that he recently received an offer for peripatetic cleaning work at various industrial sites across Northern Ireland, the Republic of Ireland, and the Isle of Man. He expressed eagerness to accept the offer, even if it means spending time away from his family. 

Discuss how Roger's case should be dealt with including Northern Ireland legislations and case laws.