How to get bail if district court rejected & chargsheet made

This case is related to NDPS act my good friend got arrested along with two other person by police.police saying accused had smaller quantity doda choura powder.My friend who working for a finical company as HR department he was not aware about what happened with him he was going to meet two people they are looking for job. Unfortunately police got powder from one of the guy at the same time police got arrested all of them. Next day we applied for regular bail in district court but they rejected its been two week my friend is in custody.Now we came to know that police has completed Chargsheet mentioning that my friend is innocent he has no involvement in the case.Mean while we also fill petition in high court for bail but unfortunately we got 15 days ahead date. Can we go back to session court or district court for bail as high court date will take more 15 days. is there any document we can show in district court ...? Also my friend who is working in good company does his job affect with case...? Waiting for your valuable suggestion Thanks in advance.