COMPULSORY urine testing on members of the Black Watch Regiment to check for drug use is being considered by the British Forces hierarchy. A police source yesterday said Military Police had proposed urine testing as a means to establish the extent of drug abuse among the regiment based at Stanley Fort. The source added police would be making efforts to close down dance parties held at Wan Chai's Viceroy of India Club, where an operation early on Sunday morning resulted in the arrest of two Black Watch privates for allegedly offering to sell Ecstasy to an undercover officer. A 15-year-old Island School student was also arrested for allegedly arranging the sale. Charges have yet to be laid as police are waiting for a scientific analysis of the drugs to be made. However, the source said it was likely the soldiers would be charged with trafficking in a dangerous drug and the schoolgirl with conspiracy to supply a dangerous drug. ''We will be trying to get dance parties stopped at the Viceroy of India Club, which shouldn't be a problem with the evidence of drug abuse we have found combined with the lack of a dance licence for the venue,'' the source said. He added that a detailed police search of the barracks at Stanley Fort conducted after the arrests revealed no narcotics. Meanwhile the two privates have resumed their normal duties at Stanley Fort and will not face military discipline. British Forces public relations director Roger Goodwin said as no charges had been laid against the pair no military action had been taken. ''This is a matter for the civilian police and if necessary the civilian courts to deal with. ''The two servicemen have returned to normal duties and will be waiting for further Hong Kong police action. ''We do not feel the situation warrants additional warnings to servicemen not to involve themselves in drugs as the British Forces already takes a very serious view of drug abuse, because of the nature of our work.'' Sources said last night Ecstasy had been gaining popularity in Hong Kong since becoming readily available on the local drug scene early last year. Ecstasy, a street name for the chemical compound MDMA, is popular among people frequenting nightclubs for its effect of creating a sensual feeling of well-being.