The methods for the analysis of official samples of substances listed in Group A of Annex I to Directive 96/23/EC, which satisfy the criteria set out in Decisions 90/515/EEC, 93/256/EEC and 93/257/EEC may be used for up to two years after this Decision enters into force. Methods currently applied for substances listed in Group B of Annex I to Directive 96/23/EC shall comply with this Decision at the latest five years after the date of application of this Decision.