As a lawyer, you have to analyze what different courses of action will have on their status. Foreigners who enter the country on a student visa can present special complications for an attorney. As an example, a student enters the country with student status, then finishes school and remains in the country illegally, working for several years. In some cases, the employee might have to leave the country to apply. If she is subject to grounds of inadmissibility, perhaps she has a relative here who can make it possible for her to apply as having a qualifying relative who will suffer extreme economic or psychological hardship if the employee is not admitted.
Immigration law can impinge on any type of business.
Businesses that rely extensively on alien workers agriculture, service industries such as motels and restaurants, etc. But these businesses must use caution. On the one hand, it is illegal to hire undocumented employees, but on the other, employers can incur civil liability for immigration-related employment discrimination if they inappropriately interview potential employees concerning their documentation. Recruitment of foreign workers can present many hidden problems. If a large high-tech company wants to recruit, say, a Russian or Indian engineer who is outstanding in his field, the employer will petition to have that person brought in.