welcome to the forum!

As for a warning page, I have never once heard any legal case being swayed or won due to a warning page being in place. I have also NEVER heard of any legal requirement for this, nor any requirement from Visa / MC / other billers. On the flip side, I have seen solid stats that show that a warning page does increase bounce rates as only 60-70% of surfers bother clicking through to the main tour page. So, IMHO, don't do it!

cheers
Luke