The Port Authority of Thailand has tried to eradicate ``tea money’’ but was unsuccessful as workers adopted a ``go-slow’’ attitude resulting in major delay and congestion in the port area during early 1999. THC has also come under the scrutiny of the Thai Ministry of Commerce but without much success as liner operators did not accept the lowering of their THC charge. The shipping lines were arguing that since the various authorities were not able to stop ``tea money’’, this cost will need to be included in their THC.