There are no rigid rules for determining whether officers have allowed a sufficient period of time to elapse before entering a building to execute a search warrant. People v. Kelver, 258 Ill. App. 3d 153, 156 (1994). Illinois has no statutory requirement that officers must knock and announce their authority, and the failure of police to do so is not a constitutional violation per se. People v. Saechao, 129 Ill. 2d 522, 531 (1989).
"This court will defer to the trial court's determination of the credibility of the witnesses and its resolution of the conflicts in the testimony." People v. Kelver, 258 Ill. App. 3d 153, 155 (1994). ΒΆ 41 Woods's proposed testimony does not refute the reasonable conclusion that defendant unlawfully possessed a substance containing Fentanyl. While Woods's testimony would have suggested that possibly someone other than defendant was tampering with the patches, such an inference does not rule out that defendant was also tampering with the patches. The trial court expressly recognized this fact.