That seems strange. If the police had responded already they would have taken him into custody and had plenty of time to get a warrant. They either screwed up or took the tape knowing it would be inadmissible.

the police said they knew when they got to the home and made the arrest the security tapes would be erased, so that's why they took them. What are others' opinions on possible evidence collection without warrant to search? They also said that at some point in the trial process the victim became a hostile witness for the prosecution refusing to testify against him. This is common in physical abuse cases. I imagine she remains in fear for her life. This thug has lots of influence.