Hello Gaius.

You answered your own question.  Set a session variable saying if the user already saw the page.

On every page check it. If False, redirect to the page (with a parameter saying where from so the user can return after agreeing).

If True, stay in current page.

Hi Gaius,

use a client variable to mark if the user already visited the policy screen.

Create a block checking if that variable was already read and put the block on every screen. If the variable is false redirect the user to the policy screen. Don't forget to set the variable to true when he visits policy screen.

Regards