Why ricin is so deadly ? Less than 1 mg injected or inhaled will kill a person several times over. Ricin poison can not be detected in toxicology scans since the poison is a catalyst the starts a chain reaction in the body, and is destroyed before the symptoms begin to show. Hm, interesting, you may free from being suspected  by the police. The only disadvantage ricin has is the time it takes for the victims to die is about 1 - 2 weeks. You may have lot of time to escape.

Ricin is at least lOx more toxic than the most potent nerve gas With properly sized and dispersed dry particles. A 1% water solution atomized with a small explosive burster has the same effectiveness as sarin nerve gas.

Okay I give you some tips to make your job easier:

1.      The seeds are readily available through wholesale seed suppliers for about $20 for a pound of seeds. In south east asia it could be cheaper only half prize!
2.      Castor bean seeds are very tough to crack/peel. Soak them for an hour in a solution of 2 tablespoons lye in 1 cup water. Then use pliers to crack the shell. The shell will peel of the bean easier.
3.      To remove almost all the castor oil from the seeds, use a 1/2 cup of acetone to every ounce of bean pulp. Blend well. Let sit for couple days with occasional shaking. Pour off the acetone and add an additional 1/2 cup of acetone and repeat.
4.      you can use change sodium sulfate with magnesium sulfate (Epsom salt)coz Epsom salt is easily available in any drug store for just $1/pound.
5.      Use a plastic membrane filter. The ricin forms a layer that is difficult to remove from a regular coffee paper filter without scraping off fibers as well.
6.      Always wear a gas mask and gloves. Try to keep the ricin wet at all times to avoid generating any dust (very toxic!). Don’t forget to get shower and change clothes after handling.