Cookstown disco deaths: No apology for drugs arrest of hotelier
The 52-year-old was arrested on suspicion of manslaughter following the deaths of three teenagers and has since been released on police bail.
On Wednesday, he was further arrested on suspicion of possession of a Class A drug with intent to supply.
But after forensic testing of the substance, he was de-arrested.
"I'm not going to apologise, but I will explain," Det Ch Insp Raymond Murray told a press conference.