Hello and thank you for your question. I am sorry to hear about what happened. There are many laws protecting wildlife in Maryland and ways to deal with what is termed "nuisance wildlife." Generally, a landowner must obtain a permit to "control" (including shoot) wildlife. The regulations may be found here http://www.dnr.state.md.us/wildlife/Licenses/pdfs/wdco_regs.pdfMaryland also has a nuisance wildlife information line that can be accessed by calling 1-877-463-6497. An information sheet on wildlife control from the University of Maryland with useful information on wildlife control may be found here http://www.maine.gov/agriculture/pesticides/gotpests/othercritters/factsheets/nuisance-wildlife-md.pdf
In addition, here are the gun laws specific to Montgomery County including gun discharge laws. http://www6.montgomerycountymd.gov/Content/home/pdf/weapons_web.pdfPlease feel free to ask any follow up questions.
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