11.   But a law enforcement official involved in the effort in Boston said that one man who had overstayed his visa had been referred to the Immigration and Naturalization Service.

12.   But because he overstayed his visa, the Immigration and Naturalization Services held him for deportation proceedings.

13.   But most of the illegal immigrants are believed to be economic migrants who overstay their visas, not people abusing the asylum process.

14.   But most of the charges are for technical violations of immigration laws, such as overstaying visas.

15.   But people are overstaying their visas.

16.   But the documents show that the detainees are accused of violating immigration laws or overstaying their visas.

17.   Federal immigration authorities say more than half of the illegal immigrants in the United States today entered first with legal documents, but overstayed their visas.

18.   Haddad, a native of Lebanon who was living in Ann Arbor, Mich., was taken into custody in December for overstaying his visa.

19.   He later moved to New Jersey, where he was recently arrested for overstaying his visa.

20.   He, too, had overstayed his visa.