The information you are referring to can be found in the book(Emigrants in bondage)by Peter Coldham and also in the CD # 350 called emigrants in bondage and the book of emigrants .You can find the results of Joseph Rash`s trial and sentence at http://www.oldbaileyonline.org/ ..
You can find more info at the Library of Va.didital collections.
Ship Dorsetshire,Captain Loney..
Hope this helps.
I am also compiling a list of all passengers that came to Virginia with him in 1736-1737,on the ship Dorsetshire.
Richard Rash