I was a student on F-1 (MS), and I got my H-1B two years ago. My company has started GC process and already got my I-140 approved. But I want to go back to school this fall (law school), which means I'll have to change my status back to F-1 again.

On December 18th 2015 I came back to USA on H-4, at that time my old passport was expiring on September 19th 2015 so the Immigration Officer approved my I-94 until September 19. Later I applied for H-1 and it got approved on Feb 2nd 2016 and my H-1 is valid until Ending Validity Date: 12/19/18 with I-94 number in it. I renewed my passport now and I have validity until 2026.
Question: Do I have to go for stamping again to extend my I-94 validity? Or since I got new I-94 with my H-1B is that good enough.

Can I apply for STEM OPT, if I work for a E-Verified staffing agency (similar to Aerotek, Kelly services) on contract basis that is related to my STEM field of education at a client location ?. (I along with staffing agency will fill out I983 form) <br>

I read online that USCIS has regulated "Certain Types of Employment" for STEM OPT in this new rule. So am worried that working for a staffing company at a client company location is therefore invalid :/ ((If so, I think then all the staffing companies would suffer as well))<br>

I have attached hereby the snippet from Federal Register:<br>

""""""There are several aspects of the STEM OPT extension that do not make it apt for certain types of arrangements, including multiple employer arrangements, sole proprietorships, employment through “temp” agencies, employment through consulting firm arrangements that provide labor for hire, and other relationships that do not constitute a bona fide employer-employee relationship. One concern arises from the difficulty individuals employed through such arrangements would face in complying with, among other things, the training plan requirements of this rule. Another concern is the potential for visa fraud arising from such arrangements. Furthermore, evaluating the merits of such arrangements would be difficult and create additional burdens for DSOs. Accordingly, DHS clarifies that students cannot qualify for STEM OPT extensions unless they will be bona fide employees of the employer signing the Training Plan, and the employer that signs the Training Plan must be the same entity that employs the student and provides the practical training experience. DHS recognizes that this outcome is a departure from SEVP's April 23, 2010 Policy Guidance (1004-03)."""""
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It would be really helpful if you could explain what the above paragraph means.