Although the databases have fantastic resources for students, they require specific keywords to return the correct results. Here are some sample keywords that relate to the podcast and your research questions:
Sarah Koenig
Adnan Syed
expert witness
cell phone tower location
plea-deals
mass communication AND criminal justice
mass media and criminal justice
justice and mass media
investigative journalism
race and criminal justice system
witness testimony and criminal justice
insufficient/ineffective legal counsel
Remember, different keywords will provide you with different results in different databases. If you run into trouble in one database, you might want to try another, or reformat your keywords. As always, if you need help, reach out to a librarian.