Scientists say the practice of feeding biological material from cows to cows can spread the disease.

CNN: Democrats criticize administration over mad cow

It is YouTube's standard practice to remove any material that they receive even the flimsiest threat for because the company wishes to avoid all litigation.

CENTERFORSECURITYPOLICY: YouTube silences Latma, removes We Con the World

One reason is that companies, in spite of urgings from various bodies set up to examine best corporate practice, rarely give them the raw material or opportunity to do so.

ECONOMIST: Keep on purring