[Q] Future warranty issues even with triangle away?

First of All, I might seem pretty vague as I cannot find the threads where I heard about all this.
So I will apologise in advance If I am talking complete non sense.:(

Knowing about all the upsides of rooting, I have been seriously considering Rooting my S3 with CF auto root and triangle away.
I understand that currently it is possible to return the phone for warranty and not have any issues with it once stock roms is applied.

What I am worried about is the future implications with rooting, right now Samsung is being quite loose with how strict they are being with letting us root etc. But I heard that they have recently started a background service which keeps tracks of custom files created when rooting and that they are doing this in order to crack down on people who have rooted, using this log when attempting to use warranty. Again this might be completely wrong.

Can anyone confirm this with me, whether this is true? I'm worried about the future implications as I am only going to keep this phone for a year and keeping the 2 year warranty would be a huge plus.

Any help would be appreciated.:)