I am a doctor from India. My case is a little complicated..
I was issued a b1b2 10 yrs multiple entry visa in 2009 when i got an medical elective at harvard (elective: doing a rotation in a US hospital without being paid.. u see patients with doctors there).. i had rotation in march and june 2009.. so i travelled twice in 4 months.. stayed 1 month each time.
a year later went for my CS exam (clinical skills exam of usmle) came back in a couple of months..
8 months later i got accepted to work as a research volunteer (was not paid) at harvard for a year.. i went on a J1 visa to which 2 years home country restriction applies..
i came back in february this year.. and just before i was suppose 2 fly.. i lost my passport.
I did not get my medicine residency this year unfortunately.. so to improve my CV.. i got 2 observerships ( u observe an attending physician see patients but do not get involved in patient care in any way)
now i am applying for b1b2 visa with observership as the purpose of visit.
I am very apprehensive that my multiple visits in the past and the lost passport history could result in a rejection.
P.S: i have passed all my usmle steps with stellar scores but my luck is playing serious games with me in the recent past.