"Thirty seconds," "that's enough," "what happened to Raheem when he was down on the ground." Wonderful subtlety: "I have the honor of representing Lewis Jackson, and honoring the memory of his slain son Raheem." The story is told in the most sympathetic way possible. The last thing Raheem heard, felt, etc.
Talks about the burden of proof.
Hold the officers responsible, compensate his dad, help us keep this from happening again.
For example, if a settlement is supposed to cover many years of loss, a dollar today is worth more than a dollar five years from now. So this concept of "present value" in a money damages case needs to take this into account.
You can imagine a spectrum of cases. There are times when you don't need an expert, or times when you don't need an expert to rebut the other side's expert, or times when expert testimony could just blow up in your face.
A fair amount of the time, it's not clear whether you need an expert or not. But note: if you want to introduce opinions or facts that are not common knowledge (e.g., alternative chokehold techniques), you might need an expert to get that point across. You need witnesses to put facts in: you can't introduce facts not in the evidentiary record.
This is why there are in-depth disclosure rules for experts (Rule 26): you turn this stuff over the other side well in advance without being asked. There are specific pieces of information you have to give: CV, other cases worked, hourly rate, a written report regarding conclusions, etc. And then the deposition.
Judges screen expert witness testimony, as well. See Daubert, for example: the lower courts excluded the expert witnesses. FRE 702 lays this out in detail.
Summary judgment (see Celotex, and also the rule): summary judgment is based on admissible evidence. So we need that opinion to be inadmissible. So take Rule 702 and Daubert (on which 702 is based), and go for it.
We can use information from discovery to which there were objections. Don't assume those obejctions were valid.
Also, look at them in reverse: impose paragraph discipline. Make sure that the key point of each paragraph is in the first sentence. That also means that the scope of the paragraph is defined in the topic sentence-- this means that you'll ever broaden topic sentences or chop paragraphs up.
If writing is unclear, these reasons are more often than not the cause.