Meanwhile there's the disruption to your life while you're being collaterally investigated, until/if you finally get a judge to say "Oh, right, we weren't supposed to be investigating you. Our bad."
depending on how the warrant is worded and what specific law enforcement branch and what specific division within that branch is doing the investigation, there won't even be an investigation.
do you really think the white collar crimes unit for the fbi is really going to even notice, let alone pass on info regarding a low level drug deal that they catch as part of their multimillion dollar investigation?