This should give you an idea.
Another resource could be Neighborhood Scout: http://www.neighborhoodscout.com/md/bethesda/crime/
I have no idea how accurate their statistics are.
As real estate practitioners we are often cautioned against answering such questions and your best line of defense would be the local police department. However reviewing the demographics of an area can also be very insightful as you make a decision in your home buying process. Please visit http://www.findmydcmetrohouse.com/Bethesda_Luxury_Fine_Homes, to find out additional information regarding the neighborhood in you wish to purchase your home.
All the Best! Natalie
If I can answer other questions, please let me know!