Browser history: Obstruction of justice? Wiping Internet tracks is Obstruction
Clearing browser cache could indeed be obstruction of justice, but the standard should be very, very strict. The government should not only have to prove the cache contained evidence of a crime, but the user cleared the cache with the clear intent of hiding said evidence. Problem is, the government is going after people who weren’t even knowingly obstructing justice.
I also think the nonsense about lying to a government official needs to be ruled unconstitutional. Freedom of speech covers lies, too.