Janet, the money order thing is standard operating procedure in jails and prisons - no cash is accepted ever! Ours is the same way where I work ... in fact, ours has to be mailed in, never dropped off in person. Ours can only get money in from people who are on their approved visiting list too ... too many "payoffs" through one inmate's family to another if they don't do it this way. Cash is NEVER accepted because it would be too easy for family members to send in $10 and then claim they sent in $20 and that somebody pocketed the difference. And until recently, we would only accept Postal money orders and no other kind because some of the others were too easily altered. We've had a HUGE problem with altered money orders - family members would buy one for $3 or $5 or $10 and then add zeros! Some are rather crudely done, but some people apparently are very good at it!
And the money orders have to be made out in the inmates name because each inmate has his own separate "trust fund" account - this is THEIR money but they can't have it in cash - for obvious reasons. When they are released, they have to be given whatever money, if any, is still in their account. There may be a problem with money in some smaller jails, but the state institutions are so strictly run, it would be almost impossible for this to happen. Our Trust Fund lady has been there for 29 years and she wouldn't be risking her job or her pension for some guy's $10!
Please don't be offended by this because I KNOW that you would never do anything like this ... but inmate's family members trying to bring in drugs or weapons, either when visiting or through the mail, is a MAJOR problem in jails and prisons. At least once a week, sometimes more, our mail room staff will find a big stash of drugs in a package being mailed in to an inmate, or catch visitors trying to bring in drugs or cash to pass off to an inmate. We've even found people who hide drugs in their childrens clothing or shoes because they assume that the children won't be searched! It's a cold, cruel world out there, and you just wouldn't believe what some people will do!