Almost all police activity is there to document crime not to prevent it. And yes. They’re full of crap here. To the best of my knowledge not once has a recover

Almost all police activity is there to document crime not to prevent it. And yes. They’re full of crap here. To the best of my knowledge not once has a recovered shell been matched to the the case casing library system - it was so ineffective that they dropped it after at least a decade of forcing mfgs to supply two shell casings with every handgun made. Shell casings are basically only good for additional evidence, they can’t even be 100% confirmed to the firearm they were shot from. The fact they even mention it is highly suspect in the truthfulness of the claim. For anyone that believes the stories… she’ll casing almost never have fingerprints on them after being fired. The firing pin indentation is not a scientific match. I can pick up shells and tell you if it was a certain gun, Glocks specifically have blocky firing pins. MP5s have fluted chambers. Extractor marks and ejector dents, etc. But it’s such minor add-on evidence. The reason you might see police marking shells at a crime is for the count of rounds far more than anything else.