Can adsense impressions and clicks be stolen?

Without you knowing

[Automotive site]

I apologise for starting another thread but I need some advice.

Is there any possibility adsense impressions and clicks can be stolen by someone employing hidden scripts? Sorry to sound so alarming but my main site has seen dramatic collapse since the start of May in CTR, ecpm and, since yesterday, adsense impressions. The impressions are even worse today compared to yesterday. Yesterday's impressions were 20% of normal daily levels and today it is at about 10% to what it should be and we are approaching here half an adsense day.

Going by patterns since the start of May, I am not expecting a sudden impressions and click dump.

Like I said in another thread, the impressions, CTR and ecpm had been so consistent for months with the small usual daily and weekend variance. But for the last 5-6 days earnings from this site is down significantly more than half of daily normal levels.

Would it make sense to send adsense team an email to let them know what is happening? I have re-pasted the adsense code several times since May just in case there were any bugs. I have even published the code in php files through wordpress admin after removing them from the plugin.

[Atomic]

What do your server logs say? Is traffic the same while AdSense impressions are down?

[Automotive site]

Yes. Traffic as measured by Statcounter and Google Analytics are normal. Adsense impressions the last two days have been about 15-20% of what it should be. The previous 3 or 4 days it was CTR and ecpm down in a massive way, but the last two days it has been impressions which is less explainable. I checked the site quite a few times both today and yesterday and the ads were showing as normal.

[Atomic]

If you are sure after subtracting Adsense views from page views that the result is not zero, perhaps no ad is being shown. Do you display an alternate ad you can look to for page views?

[Leonard0]

Check your htaccess file.
It could be possible for a hacker to modify your htaccess so that traffic sent by google (or any other SE) is redirected to the hacker's site.
All the other traffic - type-ins, bookmarks, etc - will go to your site as normal.

[DaStarBuG]

If you run a database driven website search for "base64" in your database, maybe someone injected code into your database.

Happened to me once and all google traffic was redirected exactly one time only. After that a cookie was placed and with the second run you reached my website again.
Sneaky #*$!s :/

[rlopes]

Take a look at your Coverage % in Adsense.
A low coverage will lead to fewer impressions.

[teaandbiscuits]

I placed a twitter widget in one of my pages the other day and one of my adsense blocks was not being counted,in adsense i had to clicks but no impressions.