Generally in a no body case they need to find enough blood, tissue, bone fragments, etc to indicate the person could not have survived. I don't think LE found enough physical evidence in the house or they would have charged him sooner.
I do think they have an abundance of circumstantial evidence but I'm not sure what the physical evidence could be.
Another thing that can prove a no body case is a confession to another person. It's possible that Barry could have said something incriminating to someone close to him. Imo
I think they did likely find some blood/tissue evidence at the house,
@MsBetsy. The problem was, BM had created an alibi and if the evidence was fresh, it may not have been possible to prove right away if it had been left before or after 5:00 am on Mother’s Day when BM said he had left SM sleeping. Labs for both forensic and digital testing were experiencing months long delays due to COVID-19.
LE got a second search warrant for the home on July 9th, almost two months to the day that SM went missing. I think they finally got some lab results from the first search which gave them enough probable cause to get a second warrant. A simple example might be that they found a stain which could be blood but it was not confirmed until 2 months later. This coupled with some digital evidence that was starting to trickle back in and evidence that BM had lied to LE could have been enough to get them the second search warrant.
The digital analysis can take many months. You have phones, tablets, computers, certain watches like Fitbit, vehicle gps, security footage, etc. once you see what is on those devices, you have to track that information back. For instance, if BM made a call at 4:00 am on 5/10, who did he call? Where did he call from? Was he in his vehicle? The person he called has to be interviewed. They may need to get a warrant for that person’s phone records and they have to wait again. Or SM’s phone shows a text to a friend in IN at such and such a time on Saturday. That person has to be interviewed. It is one thing to get the records back, it is another thing to analyze those records to decipher what they are telling you. Then you have to go to conduct interviews in several states.
If LE got a call to the home and BM was standing there with a smoking gun and SM was dead on the floor, you could probably make a quick arrest. However, with crafty alibis, planted evidence, lies and deceit, it does take a good deal longer.
Remember, LE has one shot at this and they want to get it right.
MOO