The number of women in prisons in federal prisons has doubled since 1991. One reason for this is the increased prosecution of the wives and girlfriends of men suspected of being drug dealers.
One example is the case of Jessica Carothers from Washington state. In 2004, Drug Enforcement Agency (DEA) agents came into her house looking for her boyfriend. He wasn’t there, and he never came back. Ms. Carothers' name wasn’t on the arrest warrant, but DEA agents found meth and a scale in the house and arrested her. Ms. Carothers claimed innocence, but initially pled guilty because her attorney encouraged her to do so by telling her the punishment was house arrest. When she found out that pleading guilty meant several years in prison away from her four year old son, she had a new lawyer who withdrew the plea. The case went to trial, and she was acquitted.
For more, check out this article from The Seattle Post-Intelligencer