Human hair, blood meal etc, etc will only work for a short duration. If you are talking about acres of fields....my suggestion would be a crop damage permit.

If you are talking about a standard garden plot what I have done for years works!

Place the 6 foot wooden or metal garden stakes about every 6-10 feet around the perimeter of your garden. Get 20lb test clear fishing line and wrap around the stakes.......using an x pattern, also going horizontally several times.....the deer will feel the test line and not know what it is .....they will not cross it. Leave yourself an entrance though... Then the addition that really makes it work is Irish Spring Soap!! I usually cut the bars in half tie a piece of fishing line around each piece...or you can use cut up panty hose to put the soap into...... place the soap on each and every post and in between tying it to the fishing line. I have used this method for the past 20 years, and live in a very high density area for deer......
My son and I eat what I grow.......not the deer. It works.....