The brand new rules are meant to help protect the race, and those involved from an incident like last year’s bombings.
The Boston Athletic Association decided on the strict, measures and made it clear they are VERY serious about their enforcement.
The Boston Globe obtained a mass email sent Wednesday outlining the details.
No longer allowed are;
• Bulky clothes, or costumes that conceal a runner's face
• Strollers at the start or finish line
• Backpacks, CamelBaks, and the bags runners often use to carry clothes and personal effects
• Glass containers
• Suitcases and rolling bags
• Vests with pockets, except lightweight running vests
• Props, including sports and military equipment
• Flags or signs wider than 11" or longer than 17"
Also more closely watched will be what’s known as bandits.
Those are the unofficial runners who for years have joined the race at various points without going through the correct channels to sign up.
The email went on to say also disallowed this year are groups “such as military ruck-marchers and cyclists, which have sometimes joined on course.
Reports say the Boston Athletic Association warns anyone without an official number would be "subject to interdiction." Brothers Dzhokhar and Tamerlan Tsarnaev are accused of setting off back-pack pressure cooker bombs near the finish of last year's race, killing three people and severely injuring nearly 300 more.
Tamerlan Tsarnaev was killed in a gun battle a few hours later while Dzhokhar was captured and is awaiting trial.