Question:
Saw a driver fill out his log book and noticed he didn't fill out the the recap # at the rt. top of page. He said he never fills that out and showed me his pevious logs to prove it. I believed that all lines had to be filled out.

Answer:
I believed that all lines had to be filled out.
Read this concerning what has to be and what's believed concerning logging.
http://www.fmcsa.dot.gov/factsfigs/log.htm
There is no recap required in the eleven requirements.
Mike
Answer:
There were some changes made in what is written on the log, recapping was one. I'm an old driver and I would never recommend drivers not keep track of their recap or daily hours. If you don't write your recap on your log, than at least record it on a note pad and keep track that way.
You need to keep track of your hours day by day, or you'll make mistakes, or forget, then you'll find yourself in trouble.
I still recapped on the log even though I didn't have to. I need to know my hours and keep track. I know a lot of fleets keep track for you but I didn't feel comfortable in someone else doing that.

Answer:
I too am aware it's not a law to do a recap,but as stated it helps you stay legal.I believe it to be a good practice and would recommend it.