Helllo Ling, I would recommend contacting the local police department to discuss any concerns that you might have regarding the safety of any area. You can also check an online sites: http://www.spotcrime.com, http://www.crimereports.com
For broadbased data on New Brunswick and/or other central New Jersey towns/cities I invite you to vist the site below.
If I can be of futher assistance and you are not already contracted to work with another Realtor, do not hesitate to contact me.
Best of luck to you.