California, United States of America
The following excerpt is from People v. Booth, 209 Cal.Rptr.3d 1, 3 Cal.App.5th 1284 (Cal. App. 2016):
[ negligence on the part of police officers in gathering evidence or in putting the case together for presentation to the district attorney ... can hardly be considered a valid police purpose justifying a lengthy delay ]; People v. Pellegrino (1978) 86 Cal.App.3d 776, 781, 150 Cal.Rptr. 486 [the police cannot merely put an ongoing investigation on the back burner hoping that it will some day simmer into something more prosecutable].)
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