This is a non-issue. The audio Amazon receives is from only-just-barely-before the wakeword up to and through the command or timeout expiration. Yes, it's possible that the defendants cat meowed right before the murder and it sounded like "Alexa". But it seems incredibly unlikely.
Prosecutors are just trying to cover every base but the likelihood that this will yield anything is very low.
Prosecutors are just trying to cover every base but the likelihood that this will yield anything is very low.