I never send real B&W film to a lab. Everything in B&W that I've ever been paid for (or that I do for myself, for that matter) I've done in my own darkroom from start to finish, be it film developing, proofs, or enlargements. When I shoot a wedding, I send out the color stuff, and I don't use C41 B&W film, so everything that's B&W goes home with me and stays there. I keep good records on developing and printing, and haven't had to tell anyone that their film "just didn't come out" since I started this many years ago. It's a lot of work sometimes, (350 engagement announcement pictures for one client last month), but I know it's done right.