Bath Rugby have issued the following statement.
"Michael Lipman, Alex Crockett and Andrew Higgins had been required to appear at an internal disciplinary hearing today to address the failure on three occasions to take a drugs test following allegations surrounding player conduct on Sunday May 10. Immediately before the hearings were due to take place the players resigned from the Club with immediate effect.
The Club regards this as an internal matter and intends to make no further comment"
R Calleja, CEO Bath Rugby