But it is LE's JOB to be suspicious. And sometimes, no offense to law enforcement, they are OVERLY suspicious. And that is ok as long as they still do their job properly.
Here is a story about suspicion:
One time, about 20 years ago, my sister got pulled over by the police. It was the middle of the afternoon. The officer came to the window, got her information, etc. then asked her how much she had to drink that day. She replied that she HAD NOT been drinking. He said "Ma'am you were swerving all over the road" He made her get out and take a sobriety test ( backwards alphabet, walk a straight line, etc.) Well, she passed it with no problem, so the officer finally let her go, grudgingly, she said. I asked her why she got pulled over if she wasn't driving badly. She said "Oh, I WAS swerving, I was trying to open a bottle of Coke while I was driving." (this was back in the day when they still had glass bottles and bottle openers) The officer did not believe her when she said she was trying to open a Coke. He thought for sure she was swerving because she was drunk.
Now this is obviously not in any way like a missing baby case, but what I am trying to say that sometimes something may seems suspicious, but there are explanations for it. Suspicion is not proof. Evidence is proof. There was no evidence that my sister was drinking, she didn't even drink, but it sure looked bad for her.
And my sister is still a bad driver