The Rules of Flat Track Roller Derby

2.3 - Jammer

2.3.1 - The Jammer’s role is to score points for their team per the specifications in Section 7 - Scoring. Each team is permitted one Jammer per jam. Prior to the start of a jam, Jammers line up on or behind the Jammer Line as specified in Section 3.2.4.

2.3.1.1 - A Jammer’s privileges include:

2.3.1.1.1 - A Jammer may earn Lead Jammer and so become the only Skater with the privilege of calling off (ending) the jam prior to the expiration of the full two minutes (see Section 2.4 - Lead Jammer).

2.3.1.1.2 - A Jammer may pass their position to the team’s Pivot according to the specifications in Section 2.5 - Passing the Star.

2.3.2 - Jammer Identification: A Skater who is serving a penalty from a prior jam in the position of Jammer will be identified as the Jammer for their team. If no such Skater exists, a Skater in possession of the Jammer helmet cover will be identified as the Jammer for their team. If no such Skater exists, one single Skater who is lined up in the Jammer Starting Position will be determined by the Jammer Referee to be the Jammer for their team. If no such Skater exists, that team is not considered to have fielded a Jammer for that jam.

2.3.2.1 - A Skater who has been identified as the Jammer for their team who is not wearing a helmet cover is considered an inactive Jammer (see Section 2.3.3).

2.3.2.2 - The Jammer’s helmet cover must have two stars that are a minimum of 4 inches (10 cm) across, from point to point. Helmet cover base color and stars must be of high contrast and easily identifiable.

2.3.2.3 - Only the Jammer’s helmet cover may have stars on it or any marks that might be confused with stars.

2.3.3 - An inactive Jammer is any Jammer who is not wearing the Jammer helmet cover with the stars visible, for any reason. An inactive Jammer has the advantage of all Jammer abilities except scoring points (Section 7 - Scoring) and earning Lead Jammer status (Section 2.4 - Lead Jammer). Inactive Jammers are not considered Blockers.