What is the state of the law on coercive interrogation in a police interview?

An interrogation room in the police station is not the most comfortable environment. Moreover, the detectives subjectively considered defendant to be a suspect and withheld this information, presumably in the hope that by doing so the interrogation would be more successful. But, with the exception of their penchant for using conversational profanity, the detectives were mild mannered in the conduct of the interview. They did not intimidate defendant physically or verbally. The interview was not unreasonably long, and defendant was provided with restroom access and beverages. (See People v. Jablonski (2006) 37 Cal.4th 774, 815-816 [interview spread over four hour period with refreshment and lunch break not coercive]; People v. Thomas (2012) 211 Cal.App.4th 987, 1011 [17 year old's four hour interview by "two experienced detectives" not coercive under totality of circumstances].) Defendant was an adult who

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