Meanwhile, smaller companies often hire resume-service bureaus and recruiters who use their own scanning systems. Avoid nontraditional fonts, including headline and script fonts such as Albertus, Brush Script, Caslon, Broadway Roman and Bullwinkle. Scanners have a difficult time reading them. The key is to choose a typeface that's easy to read and has more traditional shapes. Make sure the letters don't touch each other when they're printed.
Scanners have trouble discerning the shapes of letters that touch.
For the same reason, don't use underlining in a scannable resume. The underline cuts into the descenders of j, g, p, y and q, altering the shape of the letters. You can probably use italics as accents on your resume. Scanners can't read them. Avoid foreign accent marks and letters that aren't part of the English alphabet.