This is basically the same thing Angela Corey did to George Zimmerman.
She looked at the evidence, said she had probable cause, charged him, and lost the case.
She didn’t want to bring the evidence before a grand jury, because I imagine that would not have agreed with her assessment.
And I suspect the same thing has occurred in this case.
Alan Dershowitz believes its unlikely that any of them will be convicted simply because Mosby wildly overcharged them.
https://www.youtube.com/watch?v=pXx6Y8LKJ_0
I am no lawyer, but as I understand it, although grand juries are constitutionally required in Federal criminal cases, many (most?) states do not require grand juries to indict.
The reason why there was a grand jury for Ferguson was that the DA did not want to be accused of favoratism toward the cop.
>> And I suspect the same thing has occurred in this case.
I suspect the outcome may be the same, as well.