Is it worth roll searching Kennedy half dollars?

Sure is! I just found 46 1965-1969 silver half dollars just today from roll searching!

 

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Yes, I'd search the Kennedy rolls. Obviously, search for 1964-1970 dates. But I've heard of people finding an occasional proof coin or even a Franklin from a bank roll. Also, look for the 1998 satin finish coin. Or any satin finish coin, since they started offering those in 2005.
Also, even if all of these are modern dates, if the coin is in great condition, and I mean a frosty mark-free uncirculated coin, these can go for many dollars. Look at the price guides.
At any rate, have a good time.