Well then how come when asked for the left over vial after it has been exhausted (residue, not enough for additional administrations), for purposes of testing what was just injected, the answer is no?
Wait, what? Who has been asking for leftover vials? And who exactly have they been asking? The pharmacy tech at Walgreens? I’m not familiar with that.
And aside from policy issues at whatever provider is being asked, the ongoing shortage of borosilicate glass vials necessary for vaccine distribution may be a factor in retaining available supplies.