I work for a company in California. I get paid on a salary basis bi-weekly. I have to clock in and clock out on a daily basis. I work for 8 hours a day and ½ hour for lunch, that is 8.30 hours a day. I am required to complete 8 hours a day, not matter what. Last week I was not keeping well and I went home ½ day and I took 1 full day of time off due to my sickness. Now they are docking my pay for 1.2 days. That is as per my employer if I did not work more than 80 hours, so they will dock my pay. Last pay period (Jan1-Jan 15), I worked for a total of 92.50 hours. It also included 8 hours of holiday for Jan 1st. So as per my time sheet I worked 84.50 regular hours, and they added 8 hours for Jan 1st holiday, that totals up to 92.50.
Is it right to dock my pay if I am take 1 day leave or go home ½ a day. If so, am I not entitled to received over –time if I work more than 80 hours?

First, they can dock you for any day that you do not show up, assuming there is no sick leave policy. However, they cannot dock you for partial days.

However if you are an exempt employee you don't get overtime.

Its possible they have you classed incorrectly which could get them in trouble, but if you protest you may find yourself without a job.