Immigration reform was a hot topic in Washington during the first half of 2007, but Congress ultimately failed to pass legislation to tighten enforcement of decades-old laws that regulate which foreign-born workers are eligible to work in the United States. Fairly or not, look for employers and the HR functions to bear much of the enforcement responsibilities. Your best bet: Make sure you document employees’ eligibility to work by thoroughly completing and maintaining up-to-date I-9 forms …