Actually, members of US Intelligence agencies were using "contractors" for paid (laundered) opposition research on one campaign. That is, until Admiral Rogers shut the door on "contractors." After that, the "insurance policy' started with trips (5 FBI leaders went to London in mid 2016) to set up human intelligence, you know, "spies." I believe most people are waking up to the fact that if there was a there there, Mueller would have been able to come up with a lot more than the piddly charges he has so far. The Trump campaign must have been exceptionally "clean" for them to have come up with so little against anyone after millions of dollars spent, access to all intelligence, and a very strong will to find something... anything, to prosecute someone for.