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Uganda
Practice Relating to Rule 99. Deprivation of Liberty
Section C. Prompt information on the reasons for deprivation of liberty
In 2003, in its initial report to the Human Rights Committee, with reference to the Constitution of the Republic of Uganda, Uganda stated that “where a person is restricted or detained under a law made for the purpose of a state of emergency”, that person “shall within twenty four hours after the commencement of the restriction or detention, be furnished with a statement in writing specifying the grounds upon which he or she is restricted or detained”. 
Uganda, Initial report to the Human Rights Committee, 14 February 2003, UN Doc. CCPR/C/UGA/2003/1, 25 February 2003, § 109; see also § 218.
The report further states:
It is a pre-condition of lawful arrest that the person arrested should know the nature of the charge or suspicion for which he is arrested. And it is the duty of the person arresting to inform the arrested person the reasons for the arrest unless, of course, the arrested person creates a Situation whereby it would be impossible to inform him, say, by a counter-attack or by running away. 
Uganda, Initial report to the Human Rights Committee, 14 February 2003, UN Doc. CCPR/C/UGA/2003/1, 25 February 2003, § 226.