If you’re including authentic technical or procedural information in your crime writing, you’ll be wearing your research hat. Your story should come first, of course. However, be sure to get your facts straight before you decide if and how far you’re going to bend reality.
Procedure varies between region and country, and when your novel is set will also determine the relevance of the resources I’ve included. Still, even those outside your jurisdiction might spark an insight that drives your storyline further or deepens your characterization