A family member is looking for someone to be able to have access to bills and such in his/her name, and needs to know how to give that person power of attorney.
DUI / DWI Attorney
Easy enough. Hire an attorney who will typically be a Notary Public or have such a one on staff who goes to the jail and witnesses signing the P/A as requested. Many jails do not provided direct access to the inmate for signing papers and such because of risk in the introduction of contraband into the jail. Most lawyer would not charge a very high fee for such a service.