There are some things you don't do. Sailors know you don't spit into the wind. Singer Jim Croce observed that you don't pull on Superman's cape. In New Jersey, if police and asked you to submit to a breath test, you don't refuse. It could result in the immediate loss of your license regardless of whether you're under driving under the influence or not.
When you got your driver's license and started driving in New Jersey, you automatically gave up your right to refuse a breath test to determine if you were driving while intoxicated. Should you decide to refuse, anyway, the police can have your blood drawn at a medical clinic in order to get your blood alcohol content percentage.
If you're pulled over on suspicion of driving under the influence, you still do have certain rights. For example, you technically have the right to refuse to take a breath test. However, just having the right does not mean there are no ramifications to your actions.