The Luling police did search along Salt Flat Rd that night for the driver but the police can't just wander onto private property without permission or a search warrant. Besides, would such a small police department have enough resources to safely search over dark terrain in the middle of night? I doubt it.
I'm sure the Luling police did think the crash and the discarded clothing were strange but it's not their fault that Jason wasn't found by his car or walking along the road that night. Casting shade on the Luling police now seems unhelpful, IMO.
I hope further cell phone forensics will shed more light. Jason is out there somewhere and I hope they find him soon.
Luling Police Department | Luling, TX - Official Website