In many places they won't worry about you, because all they can show is that you made enquiries as to how to get it. They'd need to be able to demonstrate in a court that you actually purchased some and this is too much bother. In order to search your place they'd need a warrant and reasonable suspicion. Saying that you might have bought some K and that you might still have it and this is grounds for a searc that might find something is going to be far too slim to bother with.
They'll be much more interested in going up the food chain, not down. Thats were they know they'll strike gold.
I could be wrong, but I believe that here in Australia and I'm guessing in many other countries like the US, the text messages that happen to be on your phone are irrelevant, because the communications provider is required by law to keep all text transmissions that pass through their network backed up for a certain period of time.
Also, like any storage device, any text that you delete can easily be recovered from the phone using forensic software. Finally, your phone can be used to track your physical location through triangulation with phone towers. As such the authorities can figure out if you met with someone by the fact that both of your phones will be moving to the same location, remaining still for a brief while, before moving apart. Its only accurate to within hundreds of metres, but it is enough to be used as evidence in court. Personally, I'd suggest that you turn the thing off, or don't carry it if you are going to pick stuff up.
