more then 3 adsense ads on a page

during a visit on a site worldtruth.tv i shocked when i see a lot of adsense ads on a page
weather a visitor is on home page or inner page but the pages are full of adsense ads
i hear google do not allow more then 3 on a page how the make it possible
any idea ?
its really great if some one gets how they make it possible so we can use on our sites too

See original post by MrPJH