Your question does not provide enough information. What kind of warrant was she served with (arrest warrant? search warrant?) and what difference does it make.
The real issue, I guess, is what interest do you have in this situation? Your friend can ask her lawyer all kinds of questions but you would have to hire one and then you could ask them the same question. Honestly, I do not see what difference it makes under any circumstance.
Your friend almost certainly has an attorney. She can discuss the warrant issue with that attorney.
Whether she is in lockup is irrelevant to searching premises for evidence.
The foregoing is for general information purposes and does not establish an attorney-client relationship.
It is not illegal to execute a warrant on a person's home if the person is in jail. Probation/Parole warrant may be different- generally the probationer or parolee must be present at the home at the time the warrant is executed. The warrant and any evidence found can always be challenged by the person's attorney afterward.
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