The prohibition is not complete, however. The prosecution in a criminal case is allowed to present evidence of the defendant's bad character to rebut any evidence the defendant has chosen to present that shows his good character.' Also, witnesses who take the stand to testify — including a criminal defendant who chooses to do so — are subject to the possibility that some of their prior felony convictions and perhaps some other prior bad actions will be admitted into evidence to the extent that they bear on the witness' ability to tell the truth (e.g. a prior conviction for perjury or fraud). However, the court is required to weigh carefully evidence of convictions of a witness or party in a case to determine if their probative value is outweighed by their prejudicial effect.'