1) encourage safe habits (don't get passed out drunk or walk alone in dark areas or don't drink things you didn't see pourer).
2) access to rape kits and investigate claims swiftly...through the LEGAL system.
3) Offer counseling for FREE.
4) Encourage reporting.
5) And be PROACTIVE as campus police: seek out rape drugs and if certain organizations and parties are known to be guilty of this stuff...see if you can find out.
Regret is not rape. People who mix those up do a huge disservice to actual victims...looking at you Lena Dunham.