False Charge

My question involves criminal law for the state of: MD

Person A falsely charges person B with a serious crime. A's story soon unravels but B has luckily suffered no damages and so cannot sue B.
What's to prevent A from making a career of bringing false charges?

Because "people" can't bring charges. People only can make complaints. To make charges require a judge or grand jury (depending on the severity).

Fair enough!