Tips for examining expert so that you can win the case
“Dealing with Experts”
Sometimes, you won't have much choice in picking your experts (ex. The treating physician, the toxicologist who analyzed your drugs). But, if you do get the opportunity to pick your expert, think about what type of expert you'd like. Within your range of choices, do you have an expert who has practical, specific knowledge about this particular subject matter? If your case involves a crash between two sedans, you'd be better off having someone who specializes in crashes between sedans rather than a general accident reconstruction expert or someone who only works with SUV's.
Ideally, you want someone who has formal training plus practical experience. Often, jurors feel that practical knowledge is more valuable than "book knowledge." A mechanic who works on cars might be more interesting (and believable) than a Harvard educated design expert.
https://www.lawweb.in/2013/11/tips-for-examining-expert-so-that-you.html