Before blowing off about obstruction of justice, why don't you take a moment to see what the law actually says?

https://en.wikipedia.org/wiki/Obstruction_of_justice

To obstruct justice means to take concrete steps to impede an investigation; to destroy, conceal or remove evidence; to bribe witnesses or judges; or to lie under oath. (Perjury.)

To do nothing more than simply ask a law official to "let it go" is not obstruction. For instance, when you lean over from the passenger seat and ask a cop to let your buddy off a speeding ticket, you are not obstructing justice. You've made an inappropriate request, nothing more.