Can testimonial evidence be different than evidence by a lay witness? If so could you give an example for how to spot lay witness testimony? I understand that it's opinion testimony if words like "in my opinion" are used, but what else can help me spot opinion testimony?

Rules:

Testimony of Witness:

-based on personal knowledge of the matter about which they are to testify (senses-saw, heard, smell, felt, tasted)

-witness must give an oath or affirmation to testify truthfully

Testimony of a Lay Witness:

-based on witness perception

-helpful to clear understanding of facts