First, I am not a polygrapher.  I am, however, the one who decides who makes the "next step".  To reiterate, if things are precisely as you describe them, you will likely make it through the process.  Retcopper, who is a polygrapher stated the same opinion.

Don't try to overthink the situation and go in, tell the truth and let the chips fall.  I offered my assessment based on your description of the facts by the way.  If they are other than you have stated them to be, all bets would be off.  But as you said, you have no reason to lie because you are anonymous.

Good luck

Doesn't it ask you to put down your past illegal drug usage in the application, I believe it does.  So before they even talk to me personally and they are deciding on who to call to take to the next level in the process, they will probably see my past usage of marijuana a few times and shrooms once and will just look at the next guys application simply because in my area at least, there is way more demand for jobs than there is people to fill those jobs.  Of course they will probably skip me over in the hiring process if they know nothing else about me than what is on that paper and if they have 50 other applicants whom may have not listed that they tried drugs on their application.  That sucks, but I can't say I blame them.   

They don't say that acknowledging that you have a prior history in experimenting with illegal drugs that you are disqualified from the hiring process, but they do say in a nutshell on their website in the qualifications that if you leave something negative out in the initial application that they later find out through the polygraph or other means, that you will be rejected.

If everything is as you have laid it out, then I think you are about to become a Law Enforcement Officer.   

Good luck,

Private:

You should be OK.

No, actually I have no reason to take those crappy tools home, they are dollar store quality.. I have much better ones at home.  Actually what ends up happening most of the time is I bring my own tools in and somebody else steals those.

Private:

Trying mushrooms once isnt going to DQ you. If you accidentally brought home tools and then took them back upon discovering your mistake,  then no problem. BUT, and I think this is what you want to hear, if you purposely took the tools home and didnt return them then the value and the amount of times you took them will determine your success in being hired.

Good Luck

I am almost done with my criminal justice degree that I have worked hard for and have a strong desire to be a LEO, my cumulative gpa is a 3.0.  I, like many are scared of the polygraph test.  I, like many people have tried marijuana in the past, but it was during my EARLY high school years and I could count on one hand the amount of times I have done it, and I have never sold drugs or anything like that.  But one thing that is going to crappity smack me is that I have tried shrooms... One time and one time only, and it was a huge mistake, I made an idiot out of myself and made my decision that I would never do another drug again.  I want to be honest and upfront, but I am afraid they will not understand the shrooms part because the attitude of most is if you have done anything but marijuana then you should look for another career.   

That is pretty much the only fault I have, I have never had any kind of trouble with the law, I am 21 years old, been driving legally since I was 15 and a half, and have never even been pulled over before.  The only citation I have ever received was a parking ticket because of a stupid city ordinance about overnight parking that I wasn't aware of.  But I paid it promptly and didn't argue.   

Another part I am afraid of is the have you ever stolen from a previous employer question.  I have never intentionally stolen anything in my life from employers, friends, or parents.  But I have accidentally brought tools home in my pocket from work that I forgot about.  But I always returned them the next day at work, and when they ask me that question I am afraid they are going to label me a theif.  I am no saint, but am strongly against theivery, and the worst thing I could possibly be labeled is a thief.  In fact, I think I am more honest than most, I recently received about 12 dollars more back in change at a store then I should have, I didn't realize it till I got home and drove back and returned the money.

Everything I have said here is the truth, as I have no reason to lie, I am an anonymous person on the internet talking to strangers.   

So my question is to the LEO's here, should I "look for another line of work" because I did shrooms once.  I really hope that is not the only option for me as I really want to serve the country in the form of law enforcement.  I value honesty as much as the people who will be interviewing me, but if it comes down to being disqualified for a one time thing that I did that I deeply regret for the right reasons, then that sucks.