I've been building houses in Texas since 1969 and in the late 70's, or so, we had to stop using copper lines for any drops. All drops had to be done in black pipe and it is still that way today. Copper drops equal a Red Tag. I've even had to change from copper to black pipe on remodel jobs where we weren't actually working with anything to do with the copper. They have made us change it out if they see it!
We can use the polyurethane and flex, but no copper.
Joe
