Baringo has become the first County Assembly to shoot down the Building Bridges Initiative (BBI) Constitutional (Amendment) Bill after a chaotic session.
Reports indicate the House voted overwhelmingly against the Bill with 30 MCAs voting no and only five voting yes.
Five ward representatives did not participate in the exercise.
Chaos erupted immediately the counting process was completed, forcing police officers to lob teargas canisters into the assembly.
This forced MCAs and members of the press who were covering the proceedings to scamper for safety.
The Assembly rejected the Bill just a day after a meeting with Jubilee Secretary General Raphael Tuju who rallied them to pass it.
BBI is the brainchild of President Uhuru Kenyatta and his handshake partner Raila Odinga.
So far, three counties have passed the Bill. They are Kisumu, Siaya and Homa Bay.
The Bill must be passed by at least 24 assemblies before it can be tabled at the National Assembly.