Key facts: Maryland requires contestants to demonstrate pecuniary interest to establish standing; valid grounds include lack of testamentary capacity, undue influence, fraud, and improper execution; a thirty-day waiting period applies following will admission to probate; estates valued at or below fifty thousand dollars may qualify for simplified probate procedures; contests must be filed in the orphans' court or circuit court depending on jurisdiction; Maryland requires proof by preponderance of the evidence; courts may impose costs against bad-faith contestants.