on december 28 , 1989 , mr. veltmann sent a letter to the san diego health alliance stating that because of legal dispute they had not received the original order for the testing of dr. grinberg , but , he would make himself available for the required testing dr. grinberg did make himself available for random testing by sdpd , and such testing was done on january 12 , january 19 , january 25 and february 1 , 1990 .