  We study the length of $T$-contaminated runs of heads in the well-known coin
tossing experiment. A $T$-contaminated run of heads is a sequence of
consecutive heads interrupted by $T$ tails. For $T=1$ and $T=2$ we find the
asymptotic distribution for the first hitting time of the $T$ contaminated run
of heads having length $m$; furthermore, we obtain a limit theorem for the
length of the longest $T$-contaminated head run. We prove that the rate of the
approximation of our accompanying distribution for the length of the longest
$T$-contaminated head run is considerably better than the previous ones. For
the proof we use a powerful lemma by Cs\'aki, F\"oldes and Koml\'os.
