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Logic and rhetoric
An implict bias refers to the stereotypes that people unconsciously have towards people of different groups, even though that they may oppose these prejudices.People who have these bias may be completely unaware that they have it. 
There are numerous programs that are designed with the attempt to remove implicit bias, such as the test By the Implicit bias project at Harvard University. These tests try to determine your subconsus biases about people from different, religious, racial, and ethnic backgrounds.. The tests are not 100% according to many scientists and skeptics including Michael Shermer, who writes
""First, unconscious states of mind are notoriously difficult to discern and require subtle experimental protocols to elicit. Second, associations between words and categories may simply be measuring familiar cultural or linguistic affiliations— associating “blue” and “sky” faster than “blue” and “doughnuts” does not mean I unconsciously harbor a pastry prejudice. Third, negative words have more emotional salience than positive words, so the IAT may be tapping into the negativity bias instead of prejudice. Fourth, IAT researchers have been unable to produce any interventions that can reduce the alleged prejudicial associations." 
Although he says:
""For centuries the arc of the moral universe has been bending toward justice as a result of changing people’s explicit behaviors and beliefs, not on ferreting out implicit prejudicial witches through the spectral evidence of unconscious associations. Although bias and prejudice still exist, they are not remotely as bad as a mere half a century ago, much less half a millennium ago. We ought to acknowledge such progress and put our energies into figuring out what we have been doing right and do more of it.""