Not so fast, say critics, including Niamh Eastwood of Release, a drugs law organization in the UK. "By encouraging sterilisation, Project Prevention is taking away reproductive rights for women at a point when they are not able to make a clear decision about such an important issue," Eastwood wrote in a lengthy editorial. "Harris’s retort is that, if they are not able to make an informed decision about their health, they are not able to look after a child. However, it is not that simple. As a society, we must protect the fundamental human rights of every person, including their sexual and reproductive rights."
There are accusations that Harris focuses specifically on black women, and others who say that Harris views all addicts as "eternal victims," and doesn't seem to give a care what happens to these women as long as unwanted babies are not born.
Other critics question the wisdom of giving cash to drug addicts at all. The project's founder, Barbara Harris, has adopted drug-addicted babies and says most of the women contacted have already had children and know what they're doing. Link
In short I agree with the sentiment expressed on their web site: "If you can not trust someone with their reproductive choices, how can you trust them with a child?"
Now, just how reasonable that all is is also depends somewhat on how the entire process is handled to begin with, and that I don't know.