SPRINGFIELD — Wrongful convictions based on the testimony of jailhouse “snitches” has inspired a bill in the state Senate.The legislation, which expands on a current state statute, aims to make it harder for jailhouse informants to falsely incriminate a suspect in exchange for a more lenient sentence.Senate Bill 1830 would allow jailhouse informant testimony in certain cases to be challenged for reliability and require the prosecution to disclose any intent to introduce this testimony at least 30 days …