California, United States of America
The following excerpt is from People v. See, F066357 (Cal. App. 2015):
Police may use deceptive tactics, including lies, but a reviewing court will consider the impact of those tactics in determining the voluntariness of an ensuing confession. (People v. Musselwhite (1998) 17 Cal.4th 1216, 1240-1241.) However, "there must be a proximate causal connection between the deception or subterfuge and the confession." (Id. at p. 1240.)
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