The NFL regular season is only 16 games, so 4 games is a quarter of the season, which is pretty significant, however steroid testing has always been FAR more stringent in the NFL than any other team sport in the U.S., therefore making it more difficult to get away with it. However to answer your question, baseball is heavily influenced by statistics, so anything done illegally to boost your stats is considered sacriligous to baseball fans, whereas stats don't weigh as heavily in the NFL, so yes, there is not the same stigma for an NFL player who gets caught as someone in the MLB.
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