What is the best way to learn about the DHS investigation status or finding, if there is any?

It depends on when you complained, what you complained about, and how you filed your complaint. They might be actively working on it, might have...

It could mean anything, from following up on the background check, investigating the parent-child relationship (or related documents) to talking to...

My f1 student visa cancelled

You need to reapply for F1 student visa. Whether you want to use the current attorney or a new attorney is up to you. If you have studied in US...

It is possible that USCIS to know if the foreign national spouse worked or is working without a work authorization?

If the restaurant processes the immigration paperwork (Form I-9) as required, and you "lie" on that form, yes, USCIS could know about it. If you...

How can I obtain a copy of my i-94 if I entered with a Visa Waiver Program from Argentina?

You must have received I-94W ("W" for visa waiver) in 2000. Have you tried CBP website search already...

My case for asylum has been pending for over 150days, now i want to apply for EAD. Can i use my asylum acknowledgement receipt

Yes, you can file I-765 with the acknowledgement receipt as the proof of pending asylum case.

USCIS' Biometrics cover both photo and fingerprints. Yes, that photo will be used on the card.

Can you change from a B-2 visitor's visa to an F-1 student visa without having to exit and re-enter the US?

You should be able to change status from B2 to F1. Ask the designated school official (DSO) at your school for the help.

H1B transfer from my current employer to my client

Without knowing the nature of your work with the current employer and the new employer, it is hard to tell. Guessing from the use of "my client,"...

You won't go through the immigration inspection between Hawaii and California. You should be fine.