Ex_Mil8 saidIn other words, the technical evidence is used to corroborate what the officer has already seen.
Which can be applied to other beneficial ends. When my partner had his stroke in May the doctor in the ER asked me when it had hit him. I was kinda flustered from the experience and was fumbling to remember the time as best I could, since the doctor said it was crucial to the treatment approach they took.
But then I remembered I had made a 911 call for the ambulance on my cell phone, at not more than 5 minutes after he had collapsed on the floor, since I had concluded within moments it was a probable stroke or TIA. I merely had to check my recent calls and see the time stamp for the placement of the 911 call.
The doctor had his time positively confirmed within just a couple minute's accuracy; in fact, I showed him my iPhone. And he told me that was better than he could have expected, since people's anecdotal recollection of time tends to become distorted in an emergency, as I also knew myself from my Army MP experiences. For one thing we often don't think to look at our watches when a crisis is unfolding before us, and must try to reconstruct the timelines afterwards.
BTW, my husband's doing wonderfully, you would never guess he had a full stroke, his body & speech are back to fully normal (if you can overlook his Boston Italian accent). He's a great guy, and technology's a tremendous thing when used properly, and I intend to fully enjoy them both.