That's the ruling of a state appellate court, which says that by waiting only 20 to 30 seconds the police turned their knock-and-announce warrant into a no-knock warrant.
No-knock warrants are issued when officers certify that the suspect may be dangerous.
Here, a squad organized by the Camden County Prosecutor's Office, only had a knock-and-announce warrant when it went to the apartment of James Robinson in Hi-Nella.
Officers found cocaine and Robinson was convicted of drug possession.
The ruling also excludes that evidence. The prosecutor's office had no immediate comment.