One added level of security ...

Use a series of decoy cams to force the target to hide from the cam but within the actual vantage point of your hidden cams.

Give trusted people within your employ access to the video feeds to record outside the jurisdiction of the US GOV.

That way you can login and download audio and video evidence from anywhere without prying eyes or run the risk of your recordings being seized or stolen.

Lets assume that a would be criminal busts in your place, holds a gun to your head and forces you to open the safe?

If your feed is recorded offsite, you are gold.