PATS68
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So, "circumstantial" evidence is where you need to draw inferences from a direct fact in order to establish that the defendant is guilty of a crime.
Is it possible you are confusing physical evidence with direct evidence? A shell casing is physical evidence, but it does not establish any fact one way or other -- except that there is a shell casing -- without an additional inference being drawn.
A funny anecdote about a supposedly (but probably not) true cross examination shows the difference:
Q: You testified the defendant bit the victim's nose, right?
A: Yes.
Q: Did you actually see the defendant bite the victim in the nose?
A: No, I didn't see that part.
Q: Then how do you know he bit the victim's nose?
A: Because I saw him spit it out.
II. THE FOUR TYPES OF EVIDENCE.There are four traditional types of evidence: real, demonstrative, documentary, and testimonial. Some rules of evidence apply to all four types and some apply only to some or one of them. First, we will cover general rules of admissibility that apply to all evidence. Then, we will cover foundational rules that relate to specific kinds of evidence. Finally, we will cover some special topics, like the form of examination, the hearsay rule, and the lay opinion rule, that frequently cause problems in the courtroom. - See more at: Summary of the Rules of Evidence - FindLaw
This might help u out