convictions,not speaking about criminals.?
Search the Scripture to find God's will.\n\nRead & study the Scripture with faith, guided by the Holy Spirit. If one reads Scripture looking for errors or contradictions, etc, it is worthless superficial reading which even Satan will help you with.\n\nRely on God's Wisdom to understand Scripture; man's ~wisdom~ is folly.\n\nTrue Faith requires a spiritual relationship; it is not religion or denominationalism or non-denominationalism.
Yes you could find someone using ni number but only if there working or claiming benifits.  Have you tried the electorol roll?  Or the last census, all these are easily available online (I often use it to check up on new boyfriend, who they have previously lived with and so on)  If there self employed and have a limted company you can also down load their account to be super nosey!