In the guidance I've provided to lobbyists, preferential access occurs when they share a relationship. For example, I've defined “friend” and “family member”. It's also if there are financial dealings.
In terms of “friend”, it's where there is a close personal bond of affection that goes beyond simple association. To be clear, it's not part of the lobbyist's broad social or business circle. For a “family member”, it's immediate family members—spouses, children, and parents of both—and the financial interest.
In terms of making sure, in doing my outreach activities I've been making very clear to lobbyists that it's out there. I also do outreach activities with public office holders, in terms of talking about what the obligations and requirements of the lobbyists are.