Beware of Alien pub-id on Free Template

There are free Template on the webs, But are familiar with the code on it? Before using  a Free Template try to view the source code you may a pub-id that not belong to your Adsense account. Some Programers put there pub -id hide on their Template javascrifts to gain CTR. With unfamiliar user may used this ads and think he have a Ads on his blog.