The article carefully doesn’t say what, if anything, was found during the search.
An implied admission that they found no drugs is here:
“The sheriff’s office says an apology is just not happening, and they’ll continue investigating this case until they make an arrest.”
The refusal to apologize to this family and insistence that they will not leave this family alone until they arrest someone both imply that nothing was found during the raid.
They want to punish this family for their failure to research before entering this family’s house.