  We present the results of computer simulations on a class of percolative
systems, called protected percolation, that violates the Harris criterion. The
Harris criterion states whether the critical behavior at a phase transition
from a disordered state to an ordered state will be altered by impurities. We
have incorporated impurities into our simulations to test whether the critical
exponents for protected percolation are altered by impurities. We find that the
critical exponents for three-dimensional protected percolation simulations
indeed change with impurities in the form of missing sites and immortal sites.
On the other hand, the critical exponents for both standard percolation and
protected percolation in two dimensions are stable against impurities.
