I have posted – perhaps ad nauseum – about objecting to context setting testimony of law enforcement witnesses: it allows the prosecution to smuggle in all kinds of hearsay and objectionable information, designed to affect the members.
The typical answer to this skunk thrown in the “jury box” is not to ask the members not to smell it, but to them not to smell it by way of a curative instruction. I’ve also – again ad nauseum – commented that so-called curative instructions are not likely effective.
So, the 6th has addressed the issue in United States v. Nelson. Like the errors of context information there is, to quote federalevidence.com, an avoidable problem.