Police will press a drug charge on Sek Loso after substances were found in his urine.
The popular rock star was detained in Nakhon Si Thammarat after allegedly firing gunshots in public following a concert on Friday.
Metropolitan Police Bureau chief Pol Lt Gen Chanthep Sesavech said on Wednesday the Institute of Forensic Science had conducted a urine test on Sek Loso. The test resulted in a purple colour - an indication the rocker had traces of methamphetamine in his body.
Methamphetamine is listed in the most serious category of illegal substances under Thai law.
“The investigation team from the Kanna Yao Police Station will proceed in charging him for illegal substance abuse. Although he (Sek Loso) has previously been charged with the same offence and given rehabilitation, it is irrelevant to the recent incident,” Pol Lt Gen Chanthep said.
The rocker's latest run-in with the law began when he fired shots from a handgun in front of the statue of King Taksin the Great at Wat Khao Khun Phanom in Nakhon Si Thammarat, shortly after playing a concert there.
Police conducted a urine test after arresting him. The initial test result was positive but Sek claimed that it was due to sleeping pills. Police then sent the sample for further testing at the Police General Hospital.
Police took Sek to the court on Wednesday to request his detention. The court then released him on 150,000 baht bail, with the condition that he not leave the country.
Sek underwent drug rehabilitation in 2012 and the rocker vowed to stay off drugs after going through the programme.
