http://www.peterswire.net/appendix_A_state_wiretap_laws.pdf
(這個文件有 176 頁,所以打印要當心)
這裏有一個 URL 是各州的資料 (整理的很好)
http://www.rcfp.org/taping/
以馬州為例
Under Maryland’s Wiretapping and Electronic Surveillance Act, it is unlawful to tape record a conversation without the permission of all the parties