Hello, consider the following situation which for all purposes, is
purely hypothetical:

An 18 year old student attending high school needs a detailed
handwriting sample from a 17 year old student attending the same
school.  Simple enough?  Let me add a few details\requirements.

- The handwriting sample must be, handwriten and not off of a computer
(Obviously) and must be in manuscript and not cursive.

- The younger student must NOT have knowledge that the handwriting
sample is in fact a handwriting sample but rather a note or some such
object.

- The students share one class period every other day although they do
frequently see each other in their commutes to and from other courses.

- The period they share is a History course.

- The two students are friends to the level that they aren't
aquaintances, but haven't interacted at all outside of school.

- Neither student trusts the other very much but they are not to the
point of suspision.

If you can search up a good answer for me you will be paid for
answering the question.  If you can search up a question that I
determine to be successful, you will be tipped $10.00 and very likely
be given a 5 star rating.  Any requests for additional information
welcome.  Please take a shot with a comment if you wish to as well.

Finally, if you can come up with an answer with little or no
searching, good for you, that is completely fine!  It is not required
to have a link to anything posted.

Easy!

Using a Box Number, advertise a well paid sinecure that will appeal to the target.

Specify that applications must be handwritten, etc.

Bring said advert to attention of target, saying 'Hey this looks as
though it was written with you in mind ...'

ask politely to borrow their notes.

now I do wonder why you would need such a sample.........purely
hypothetical of course

QUOTE
.........."and must be in manuscript and not cursive".

I guess for what both commenters so far came up with,this requirement
will probably not be met.........

Heres an idea, there in school, students, young! 
Have the older child pass a note to the younger one, its school everyone did it. 
When the younger one responds it will most likely be in regular type. 


***Solved*** :)

Not quite so easy.  As far as notes being passed, the matter simply
won't be that easy.  In said History course a student teacher is
currently presiding and has virtually no control over the students. 
If any message was needed to be coveyed the two could simply
communicate verbally at full volume without reprecussion.

Secondly, notes may not be borrowed.  It can not be a "school"
document as part of the handwriting sample.  Legal issues...

As to why I need this info, I'll explain some time in the future.  For
now, just consider it a hypothetical game.

Get a piece of paper and at the top of it write some random sentence. 
Then have 5 or more random people copy the sentence.  Then in class
ask her "could you copy this sentence here for me?  Its for a project"
 Hopefully then she will copy the sentence and you have your
handwriting sample.

I've thought of that.  I might try it out.  

Before I do, however, I will tell you of a detail.  This is to prove
one persons  innocence and save the life of another.