The source code for crispr-screens can be found on Github at https://github.com/niekwit/crispr-screens.
Reporting issues
If you encounter any issues or have any suggestions for improvements, please report them on the GitHub issue tracker at https://github.com/niekwit/crispr-screens/issues. Please include as much information as possible, including the version of crispr-screens you are using, the command you ran, and the error message you received.