5月2日一则新闻：NEW YORK (Reuters) - Special Counsel Robert Mueller, in a meeting with U.S. President Donald Trump's lawyers in March, raised the possibility of issuing a subpoena for Trump if he declines to talk to investigators in the Russia probe, a former lawyer for the president said on Tuesday.
Subpoena在上面有关川普的新闻里是最好的使用场景例子，这“传票”不是个人有官司在身，而且是被要求配合他人的调查或者案件到法庭现场作证或者提供证据。延展一点，一般是证人不“自愿”配合作证法院才会发出Subpoena要求执行，仍不配合会导致惩罚。
Summons多与Court Summons结合使用，指法院发出传票要求原告或被告出庭，那么这人显然是诉讼当事人。延展一点，可以个人自己出庭或者委托律师代理出庭。
