You are correct, I am begging the question, the DOJ are investigating the question. Maybe they will find the DEA and SOD are acting illegally. Hopefully they will. Those who would defend the use of NSA data for domestic crimes are dangerously close to advocating for a police state.
I may have written that quote and edited out because it was wrong. Sorry about that.
I doubt I am mistaken about the poisoned tree though because a source of evidence that may have exculpatory evidence is being obscured. It may also be acquired illegally but that is obscured too.
Implicit in your reply is an admission that the NSA tips are being used.
"people aren't being snatched up off the streets because of the NSA's monitoring programs."
Do you still stand by this because now there's evidence presented to you that the IRS and the DEA have access to NSA tips through the SOD?
A statement from the NSA:
"If the intelligence community collects information pursuant to a valid foreign intelligence tasking that is recognised as being evidence of a crime, [it] can disseminate that information to law enforcement, as appropriate."
I think your example of NSA tips is rather convoluted, I prefer the NSA's statement above as it's pretty clear and leaves little to the imagination.