LE has such a daunting task on their hands with respect to searches. They are questioning people and then have to make the decision to go through the courts for a warrant. The process must be laborious and painstaking.
Many W-Sleuthers have suggested she might have been abducted by a (possibly) local person between 5:30 am and 6:00 am while on the walk to her mother's home to retrieve the car.
If Molly was walking/running at 5:45 let's say, and a severe thunderstorm came through, many WS-er's have posited that a known individual might have offered her a ride. She was wet, 10 minutes into her walk, in a hurry, etc. And she trusted this person. It's understandable she didn't want to be rude, and would get in the car, thinking, for example, something like:
"Oh of course, this is the guy whom my mom knows from the church picnic three weeks ago."
(or)
"Yeah, this guy worked at my middle school years ago; ..."
(or)
"No problem. This person is part of a large extended farming family in these parts... ...."
With LE ALREADY searching hog farms in the area, it could be that there is
(a) phoned-in tips
(b) cell phone/fit-bit pings, or trace
(c) combo of both
(d) some other info leading them to search several pig farms
How does LE get all those warrants to search completely? It must clog the courts for days? The searches must be exhausting and inconclusive.
Especially if there is a FAMILY COMPOUND of a couple of properties together, (yards abutting each other) owned by several members of one family. That must be crazy-complicated for LE. A lot of times, there are paths between family member's homes that connect the properties, so people can quickly visit each other. No one knows about the paths except the family, and their employees.......... It boggles the mind how many possibilities there are for foul play to happen, and for evidence to be hidden, and also, for no one to notice the strange hours a family member/employee was keeping or what they were doing with equipment, facilities, and vehicles. (as many Websleuthers have suggested)
LE must be LOSING their collective minds, at the PACE of this investigation.
Because if they are investigating all members of the C-Family, let's say, or anybody else, and are ALSO having to view them as having properties that are basically a "C-Family-Compound", LE would then need at least three, four,......or more search warrants to effective search EVERYWHERE.
It's possible that LE would probably have to
1) interview every employee and trace their phone usage, driving patterns, delivery routes, etc.
2) THOROUGHLY examine every tool-shed, walk-in refrigerator/freezer, vehicle(recreational/farming/ATV), compost pile, basement, tornado shelter, water-well house, wine cellar, oven/fireplace/hearth, barn, field shed, boat house along a river, on-site machine shops, livestock areas (food troughs, manure troughs, etc), heavy equipment (wood chippers, harvesting combines), etc.
3) COMPLETELY follow every outdoor-path leading in, out and around these properties......
.........to gather evidence of any kind.
The search process of farmland that has been in a family for generations has to insanely extensive, often fruitless, time-consuming, and agonizing for all involved....that includes MT's family, the entire surrounding community, and LE.