愷他命是一種已被證明會嚴重損害使用者身體以及精神的成癮性毒品。由於其低成本、低刑責等因素，愷他命已經成為東南亞年輕人與青少年中最流行的俱樂部藥物的其中一種。本篇研究提出一項搭配藍芽連線口水檢測器的智慧型手機支援系統協助來作為輔助愷他命依賴病患自我監控其愷他命使用情形並助其獲得、維持與練習可以處理高危險情境的應對技能以預防毒品再用。我們也進行了兩個真實世界的實驗來評估此系統的可行性以及了解潛在的設計挑戰。第一個實驗對三個愷他命依賴患者進行研究，要求患者每天做至少一次自我實施的口水檢測，實驗持續三個星期。下一個實驗對另外三個正在恢復中的愷他命依賴門診病患進行使用者測試。後續的訪談揭露了有關如何設計這樣的自我監控系統以及如何讓毒品依賴病患與其治療師在日常生活中教學與學習應對技巧的相關設計挑戰。

Ketamine is an addictive drug that has been shown to inflict considerable physical and mental damage on users. Due in part to its low cost, ketamine has become one of the most popular club drugs among young adults and teenagers in Southeast Asia. This paper proposes a phone-based support system with Bluetooth-enabled device for the screening of saliva, as a means of assisting ketamine-dependent patients to self-monitor their ketamine use and helping them obtain, maintain, and practice coping skills for dealing with high-risk situations, thereby preventing drug relapse. We also conducted two real-world practical experiment to evaluate the feasibility of the proposed system and understand the underlying design challenges. First study is wherein three ketamine-dependent patients self-administered tests at least once per day over a period of three weeks. The following study conducted user testing on three recovering drug-dependent patients, different from the former experiment, receiving outpatient abstinence treatment at a hospital. Follow-up interviews revealed design-related challenges regarding how to design such self-monitoring system and how to engage drug-dependent patients and therapists about learning and teaching coping strategies for daily life.

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