Auto-motive.
Forensic Files - 2000 Auto-Motive was released on: USA: 29 April 2011
a motive is something a criminal has
Miami Undercover - 1961 Auto Motive 1-25 was released on: USA: 9 July 1961
identifying a motive is seeing why the person committed the crime.
I am assuming you mean as in "motivation." Motive means the determination of a certain phenomena that is not obvious.
To question a motive would be to question why someone had/has a reason or motivation to do something.
Ulterior thought, often called ulterior motive, is the underlying or concealed motive behind a request. It is usually considered to be a selfish or negative hidden motive.
the reasons for the characters actions in a story
A by-motive is a hidden motive.
it means to eat an ancient fruit
An ulterior motive is a motive that they have beyond the main motive. They often do not show that they have this motive and it is often not good. The ulterior motive is almost always has it for their own good only.