California, United States of America
The following excerpt is from People v. Sehmbey, F069142, F069567 (Cal. App. 2016):
agreement requiring only that the witness testify fully and truthfully is valid. [Citations.]" (People v. Allen (1986) 42 Cal.3d 1222, 1251-1252, fn. omitted.) This is so even when the prosecutor believes a particular account is truthful, and might take the position, if the witness deviated materially from it, that the bargain had been breached and the witness could be prosecuted. (See People v. Fields (1983) 35 Cal.3d 329, 361.)
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