What is the definition of an expert witness?

#1  One page

What is the definition of an expert witness? Explain in your own words.

Who can be an expert witness? Explain.

What restrictions are placed against expert witnesses?

How are lay witnesses and expert witnesses different? Explain in detail. 

#2

Address the following in 2 pages:

Explain the Daubert Rule in contrast to the Frye Standard and disclose which one of the two would allow for the identification of more expert witnesses if they were used exclusively.

Be sure to reference all sources using APA style.