Based on the provided legal document, the key points relevant to the issue of bail cancellation under the NDPS Act are as follows:

1. Statutory Requirements for Bail Cancellation: The cancellation of bail must strictly satisfy the statutory criteria outlined in the relevant provisions. The court must find that the accused misused the liberty granted, such as tampering with evidence, influencing witnesses, or attempting to abscond (!) (!) .

2. Special Provisions under the NDPS Act: The NDPS Act has specific provisions that restrict the grant of bail, especially for offences involving commercial quantities. The Act mandates that no person accused of such offences shall be released on bail unless certain conditions are met, including the opportunity for the Public Prosecutor to oppose the application and the court's satisfaction that the accused is unlikely to commit further offences (!) (!) (!) (!) .

3. Definition of Quantities: The Act distinguishes between small, intermediate, and commercial quantities, with the latter being subject to more stringent restrictions on bail. The quantity recovered and the classification under the notification are crucial in determining whether bail should be granted or revoked (!) (!) (!) .

4. Contradictory Laboratory Reports: When two laboratories provide differing opinions regarding the presence of narcotic substances, the court should favor the view that leans in favor of the accused. The reliance on laboratory reports must be carefully scrutinized, especially when the reports are contradictory (!) (!) (!) (!) .

5. Relevance of Confessional Statements: Confessional statements made by the accused, particularly if retracted, cannot solely form the basis for conviction or for the cancellation of bail unless supported by substantive evidence. The prosecution's failure to establish the presence of narcotic substances in the seized material weakens the grounds for bail cancellation (!) (!) .

6. Legal Principles for Bail and Its Cancellation: Granting bail is a matter of judicial discretion, but its cancellation requires clear supervening circumstances indicating misuse. Mere change of circumstances or the fact that witnesses have turned hostile does not automatically justify bail cancellation unless there is evidence of influence or tampering (!) (!) .

7. Application of the NDPS Act’s Provisions: The provisions are designed to prevent the accused from committing further offences and to ensure the integrity of the trial process. The court must balance individual liberty with the need to prevent misuse of the law, especially in cases involving serious charges under the NDPS Act (!) (!) .

8. Procedural Aspects: The court must ensure that the procedures laid down in the Act and the Rules are followed, including the proper examination of laboratory reports and adherence to the criteria for bail and its cancellation. The court's reliance on reports from authorized laboratories is appropriate, but contradictory findings must be carefully weighed (!) (!) .

In summary, the decision to cancel bail under the NDPS Act hinges on whether the statutory conditions are met, the nature and quantity of the seized substance, the credibility of laboratory reports, and whether there is evidence of misuse of liberty by the accused.