In 2002, various news sources reported that a red heifer was found and the Temple Institute in Israel declared it kosher. Many of these sources later reported that the parah aduma was disqualified later that year, but I cannot find any information on why it was disqualified. Does anybody know why the 2002 red heifer was disqualified?
According to GlobalNext.org - page 5 the Para Aduma born in 2002 was disqualified as it grew 3 white hairs.
Since the link in Gershon Gold's answer no longer works and I have been unsuccessful at finding any other information online, I decided to email the Temple Institute in Jerusalem. This is a quote from the email I received back:
Previous candidates for parah adumah have been disqualified after having grown more than two non-red hairs. A parah adumah born a year ago in New Jersey was disqualified after it became pregnant and gave birth.
So apparently the 2002 parah adumah did indeed grow more than two non-red hairs.