Casey-Owens M
J Forensic Sci. 1984 Jul;29(3):816-9.
Anonymous letters fall into many categories--threats, obscene messages, racial slurs, extortion demands, guilty conscience statements, stool pigeon letters, robbery or burglary notes, and so forth. These are examined by the document examiner for any information that may lead to the identity of the writer. Such examinations involve unusual aspects of paper or envelopes, watermarks, detection of indented impressions, and so on, and also a comparison with previous anonymous submissions. Several cases will be discussed where, additionally, psychological profiles of the writer were produced by a psychiatrist and a psychologist, based upon the content of the letters.
匿名信有很多种类——威胁信、猥琐信息、种族诋毁、勒索要求、愧疚自白、告密信、抢劫或入室盗窃留言等等。文件检验员会对这些信件进行检查，寻找任何可能指向写信人身份的信息。此类检查涉及纸张或信封的异常特征、水印、压痕检测等，还会与之前的匿名信件进行比对。此外，还将讨论一些案例，在这些案例中，精神病医生和心理学家根据信件内容对写信人进行了心理侧写。
