Wouldn't the evidence be US law? As far as I know nobody can lawfully resist (nor even disclose) a national security letter. The only workaround is to not hold

Wouldn't the evidence be US law? As far as I know nobody can lawfully resist (nor even disclose) a national security letter. The only workaround is to not hold any data of interest to the government so they would have no reason to send one in the first place. However, besides national security letters, I'm not even sure one would be needed when there's a healthy industry of data brokers happy to sell the data.