keep it in a memory card and put inside ur wallet.

make it easily accessible so that it can easily be proven for academic or self learning purposes.

just relax and take it easy...

let them know exactly why you did those experiment. Do you have a certification on that? Is it necessary for your job? You need to answer those questions yourself before braving those people.

if you're only normal citizen, with everything following the rules, i doubt they'll check u la.