Is there a secret LSD connection in the Manson-Tate murders?

http://books.google.com/books?id=PkNA4uMtflwC&pg=PA271&lpg=PA271&dq=%22William+Mentzer%22+cult&source=bl&ots=pMcF8FlRlv&sig=br4iTUhDfKGXj2L-Na8sxahrJhE&hl=en&ei=wZVWS8_TKpOENPX5iNEE&sa=X&oi=book_result&ct=result&resnum=4&ved=0CBQQ6AEwAw#v=onepage&q=%22William%20Mentzer%22%20cult&f=false