At the Crime Suppression Division’s headquarters, 34 of them turned up and acknowledged the charges.
The 80 people own or represent 30 LPG-transfer facilities and 43 LPG service stations across the country.
Pol General Worraphong Chewpreecha, a deputy police chief who was present at the CSD session receiving the 34 people who responded to the summons, said around 300 LPG service stations had committed the same crimes.
The offences involve several laws, include transferring and loading or extracting LPG without permission, selling LPG that is not purchased from authorised sellers, violating safety regulations on storage of dangerous materials, violating an anti-hoarding law, misuse of LPG, and violating ministerial regulations of LPG trade and sale.
Five people have previously been charged with the same offences along with owners of LPG service stations.
“The [nearly] 50 people who did not show up yesterday are subject to warrants for their acknowledgement of the crimes,” Worraphong said.