The best way is by talking to other international students and Rice alumni who were international students. Those organizations that have hired international students for summer or full-time positions in the past are very likely to continue to hire them. If a company is participating in the Campus Recruiting Program at the Career Services Center, you may search the on-line database to see if they indicate that they will hire individuals with Practical Training. Companies often change their hiring practices. However, it is always good to find out the real story.
Alumni currently working for the organization are a good start.
You may find that while the company no longer actively recruits international students, they will still hire international students in certain instances. A recruiter may not give out this information freely, but others within the organization may be more willing to share. If a company indicates in their material for the Campus Recruiting Program that they are not accepting applications from international students, you should not apply through the Career Services Center. If they have a history of hiring them, send a cover letter and resume directly to the contact listed with the Career Services Center. This letter should detail your qualifications and reasons for your interest in that company.