The effectiveness of intelligence operations is directly related to the conduct of intelligence officers and depends on their moral attitudes and system of values. The specifics of intelligence operations may lead to moral dilemmas in the behaviour of the officers. The operating methods of intelligence institutions include both ethical tactical elements and those that run counter to the generally accepted ethical principles that could discredit democracy and the fundamental values that the state advocates. This article analyses the ethical problems that are encountered in the process of using HUMINT, an intelligence method. The authors employ theoretical analysis to construct an initial integral behaviour model of the intelligence officer based on the context of choices and operational implications that could encourage further scientific discussion of the subject.