You are not being tried in a court under the ruleset of an individual state, the fed, etc. You are under the prosecution of a private entity and their private police force, which has no obligation to follow rules of state run police.
The only reason they should care about the law of the land is when they themselves are violating it, and there is no law that says "all private police and prosecution must also abide by innocent until proven guilty".
The only reason they should care about the law of the land is when they themselves are violating it, and there is no law that says "all private police and prosecution must also abide by innocent until proven guilty".