From the CMS League wide General Rules & Regs:

2. Race Starts

2.1 The start of every race can be the point where accidents can be the most damaging both for our competitors and our race series. An accident early on can put an end to the race for a large portion of the field. Champion Motorsports expects that everyone take care not to be over aggressive on race starts or for the first laps of any event. Remember that many of our races are long and it is far more important to keep your cars in one piece than to pass a few competitors in the early going. In Road Racing, “The Start” is considered a chance to gain advantage or position over other competitors. Here at Champion Motorsports that is not the case! “The Start” is an obstacle we must all attempt to overcome safely. Simply put, charging through the grid gaining positions, getting a great start, is not what race officials are hoping to see. All competitors enjoying a safe, controlled and timely start when the lights turn green is the action we expect.

2.2 In order to place some control over the possibility of first lap incidents we will consider the area between the “Start Line”, (including the your starting grid position), until the end of the designated Orange Zone (OZ) area marked on the trackmap included in each driver briefing as an area where passing is to be conducted with extreme care. Should an incident occur because a driver chooses to pass in this “Orange Zone” the driver making the pass will most likely be held responsible for the incident.

2.2.1 All race starts, including the Orange Zone will be reviewed by the Race Review Committee following the event and penalties will be issued to drivers who are considered to be at fault. Please note that a driver can cause an accident without making contact with another car.