Fetch contact from contact store using 'NOTE'

Hi,
I have implemented CNContact library to manipulate contact from local contact store. Am saving contact to contact store including a note which contains an identifier by which i can identify my app created contact when an existing user relogin into my app. To identify app created contact i have only option left to use that note i have saved along with that contact. it means i have to fetch those record using 'NOTE'.
So, i just want to know that is there any way to serve my purpose.