Current CRISPR gene drives are too strong for outdoor use, studies warn
Heritable gene-editing tools need reliable brakes to prevent them from spreading worldwide
![brushtail possum](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/11/111617_SM_genedrive_feat.jpg?fit=860%2C460&ssl=1)
SO CUTE, SO WRONG No one has a genetic way of getting rid of invasive brushtail possums (shown) in New Zealand, but now is the time to debate whether CRISPR gene drives are too strong to be considered, two researchers argue.
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