[riri]

This chick was lying through her teeth. Especially, the part where she claimed cracker meant "someone who was acting all police like'.

And it's clear she was not intelligent enough to think quick enough to make up the lies, so someone must have coached her on what to say.

[TigersEye]

You might want to see what the term ass cracker means before entirely dismissing Mz. Jeantel's statements.

[a fool in paradise]

I went to the Urban Dictionary online

It took me several pages of reading to reach a definition that said that term can apply to any cop or security, regardless of skin color.

Which then proves Mr. Martin knew or at least suspected that Mr. Zimmerman was working in the capacity of a security watchman.