Forced to wear GPS tracking device or get detained because of Obama's new laws(they said).

yes they can or they can take you into custody. You should consider having an immigration attorney represent you.

If someone had a mental illness in the past and is improved now, does he need to show any evidence about that to USA embassy in-

Speak directly with an immigration attorney as more detail is required.

What is the different between a consular and an ambassador? for applying USA visas, who will interview with me?

In very brief and generalization consular officers process visa requests, Ambassador represent US interests to the country to which they are assisgned

If someone in USA needs a singer from another country, does the visa issuance process for the singer requires interview?

In most instances a visa interview may be required.

You are asked on the visa application and must answer correctly.

I filled my n400 in 12/23/2013 got interviewed in 06/02/2014 i have 2 dismiss criminal cases

Make an info pass at your local CIS office. If not satisfied consider retaining an immigration attorney.

A a part of the visa issuing processes psychologists are not employed by US consualtes

The day i landed in Canada, husband threatened/neglected me to go back to India.so staying alone & since then .will i get PR ?

Contact a Canadian attorney for best advice

When is the best time to apply for a 601 waiver for my spouse who is undergoing treatment for TB in the Philippines?

I agree with my colleague, when treatment done then proceed

My husband and I left the US before my ajustment of status, would this be seen as abandoned Of my status.

It may be possible to proceed through consular processing depending upon the status of the visa petition you were using to support the adjustment...