clear/delete log from 'last' or 'lastlog' command

Dear Friends ,

From 'last' or 'lastlog' command , I can get the last login informations of the users . now as a system admin , If I want to delete the log information from this 'last' 'lastog' command , then is it possible to do ?

plz inform ... ...

you can flush out(make zero byte) /var/adm/wtmp....

But it is not highly recomended