Has anyone else noticed this ?? if not its easy for you to test and see

so as i own and AOR DV1 i have used google to keep up to date with the latest releases and developments. i do this with a lot of things i take interest in to get the latest and newest info out there and to be honest i have been hoping something will be released to decode tetra and unencrypt which i know is a long shot.
anyway back to the topic in hand. so to get all the latest and newest posts/articles/sites mentioning tetra airwave i use google and search for results only in the past 24hrs so i get only everything new. i have been doing this for a while now for "tetra airwave" and find a lot of results are replaced with porn/virus/scam sites. try it yourself to see. and i do use this method for a lot of searches but it is only for tetra airwave i have been noticing this odd occurrence.
I wont post screenshots/links of the porn and virus scam sites but to see what i mean go to http://www.google.com and type in tetra airwave. click tools and change any time to the last 24 hours and look at and click on the results....
This has been going on for a long time now. is it a cover up ? is it gov or tetra themselves doing it ? i dont know what it is but its a bit weird ?