Inhouse testing recognition permits reliance on certified export test results to log DEEC/Pass Book benefits, subject to surprise Customs checks. Manufacturer exporters may rely on recognized inhouse testing facilities (GMP, ISI/CSIR/Ministry approval, or ISO 9002) by enclosing inhouse test certificates with the shipping bill to avoid Customs sample drawal for DEEC and Pass Book logging. Alternatively, certified Central Excise test reports showing required technical characteristics, accompanied by the factory examination report, may be used to waive sampling; such reports are valid for six months. Customs retains the right to draw samples or withdraw these facilities if adverse information arises.