Potassium Argon Dating doesnt work at all

The KBS tuff (a lava flow) was K-ar dated as being around 212 million years old. But then they found a perfectly normal human skull underneath the KBS tuff (indicating that the tuff was much, much younger than recently thought). A "40-million-year-old" petrified tree was found with a "50-million-year-old" bee nest inside it!Here's the kicker--geology professors wanted to test the age of a potassium-granite stone, but 80% of the potassium argon washed off the rock before their eyes. So, that they would have been WAY OFF if they thought they could K-ar date a rock that is missing 80% of the evidence!
Trust me, all the evidence that supports evolution and an old-earth are inconclusive.

If you want more on the KBS tuff, lava flows, and K-ar dating, check out the sources below. First off, no amount of radiometric dating can be trusted completely (they are relying on too many variables). Some of the 'assumed factors' may be: has the K-ar been contaminated or has it been washed off; was there always the same amount of K-ar that would not fluctuate in the rock layers; has the 1/2-life of the radioactive isotopes been the same throughout all time and conditions (like fluctuations in the radiation from the sun, mineral deposits due to rain and erosion...)
Here is some areas to read up on both sides of the argument:Evolution-Facts | Fakta & Evolusi Ilmiah Dinosaur Adventure Land (this one is where I first heard about the KBS tuff).
http://www.projectcreation.orgFerrell, Vance. "The Evolution Cruncher."Morris, Dr. John. "Young Earth."Young, Dr. Brian. "Doubts about Creation? Not after This!"

As with any other means of aging, light decay (or progression) isn't accurately known whether it stays the same throughout all space and time. If I walked outside to the highway, and see a car heading east toward Chicago at a constant speed and direction, that would not PROVE that the car started in Oregon four days ago. Similarly, it is too difficult to tell how fast light traveled 4 million light years from earth, 6 thousand years ago.