From Thompson v. Jacoby, 2010 U.S. App. LEXIS 13371 (11th Cir. 2010):
If the court finds a party or attorney violated any requirement of Rule 11(b), the court "shall" impose sanctions in accordance with Rule 11. 15 U.S.C. § 78u-4(c)(3). If a complaint substantially fails to comply with Rule 11(b), the presumptive sanction is attorn ...
From Thompson v. Jacoby, 2010 U.S. App. LEXIS 13371 (11th Cir. 2010):
If the court finds a party or attorney violated any requirement of Rule 11(b), the court “shall” impose sanctions in accordance with Rule 11. 15 U.S.C. § 78u-4(c)(3).…