http://www.norml.org/index.cfm?wtm_view=&Group_ID=4566
Erowid's Vault:
TEXAS 'M'
Possession
<=2oz.:0-6mos.; $1,000
>2oz.-4oz.:0-1; $2,000
>4oz.-5lb.:2-10; $10,000
>5lb.-50lb.:2-20; $10,000
>50lb.: See below
Cultivation/Delivery/Sale
<=.25oz.:0-1; $2,000
>.25oz.-4oz.:2-10; $10,000
>4oz.-5lb.:2-20; $10,000
>5lb.-50lb.:5-99; $10,000
>50lb.-200lb.:5-99; $50,000
>200lb.-2,000lb.:10-life; $100,000
>2,000lb.:15-99; $250,000
I cannot find anything concrete on the statute of limitations. you would have to contact a lawyer on that one as it varies from state to state and crime to crime with many different variances. welcome to the system screwy as hell. Here is a court case that popped up in my google it addresses some statute of limitations and what it can and cannot bar in the certain case if that helps.
http://www.norml.org/index.cfm?Group_ID=4946
Side not: Personal injury in the state of Texas is 2 years from one site.
Can I ask why you want to know?