NEW DELHI: The interim report of the Central Forensic Sciences Laboratory (CFSL) on the gastric lavage (stomach wash) of Rahul Mahajan, embroiled in a drug abuse case, show metabolites of heroin and cocaine but there was no presence of alcohol, official sources said here on Wednesday.

They said the test report of Rahul showed only presence of the two psychotropic substances in his stomach wash while the gastric lavage of late Pramod Mahajan's secretary Vivek Moitra showed the presence of ethanol besides metabolites of heroin and cocaine.

According to the sources, heroin changes its form once it mixes with the gastric juices of the stomach while cocaine remains unchanged.

The two gastric lavages were part of the five samples handed over to the CFSL on June 3 by the Delhi Police.

The scientists also carried out mass spectro photometric test and Thin Layer Chromotographic (TLC) on stained clothes of Mahajan and Moitra during which it again found stains of the two psychotropic substances.

The Delhi Police had handed over an upper garment as well as an under garment of the duo for examination.

The pouch recovered from Moitra's body, which was handed over to the CFSL by the Delhi Police, has already been confirmed as heroin.