It adds that tighter controls on immigration could reduce the numbers of migrant workers from developing countries who are able to send money home - a substantial source of income for many Caribbean, Central American and South Asian countries.

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Later, she also determine that batteries needed to be replaced every two years, and set up a database to automatically send letters to every customer one month before their battery expired creating a whole new revenue source for her business.

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Just 44% of marketers surveyed believe their organizations were in compliance with the CAN-SPAM act, a law that requires marketers to request permission to send email messages, disclose the messages' source and offer an opt-out function.

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While a source close to the investigation told CNN that officials doubt the short letter would be enough to "send him over the edge, " Weston's parents told the FBI that they believe "the letter would have scared their son about the federal government, " according to an FBI affidavit filed to obtain a search warrant for his residence.

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