大家给看这是啥文件? 用回复吗?既没有罚款, 也没有deadline.

This is not a Summons to Appear.
There is no fine associated with this Notice.
Complete the information on the back of this page, identifying the driver of your vehicle at the time of the violation, and return to the address indicated.

Violation Processing Center
Photo Traffic Enforcement Program PO Box 59995
Phoenix, AZ 85076-9995
我们刚来一年, 去Phoenix 玩, 被晒的脱了一层皮不说, 还被照了超速. 当时是我的朋友在开我的车. 我们轮换着开. 她戴着帽子, 戴着墨镜, 一看就是女的, 肯定不是我- 我是男的.
我需要回信吗? 但把朋友供出去, 不太仗义吧? 怎么办呢? 请给点意见. 谢了先.