mdadm path not read by cron

[arsnova]

Using Intrepid, I can issue manually mdadm commands, for example:

mdadm --misc --detail --test /dev/md0

and I can preface this with the path:

/sbin/mdadm --misc --detail --test /dev/md0

These both give the expected information. Yet, my crontab entry replies to root with "/bin/sh: mdadm: not found." What am I doing incorrectly? For testing purposes, my crontab line is:

*/15 * * * * mdadm --misc --detail --test /dev/md0

and I've tried committing the path as well:

*/15 * * * * /sbin/mdadm --misc --detail --test /dev/md0

I'm sure this is something basic, but I'm stumped. Thanks in advance!