One of the notable cases in a recent review of forensic bryology—covered in our earlier article on moss solving crimes—is the 2009 Burr Oak Cemetery scandal in Alsip, Illinois. A small clump of moss provided crucial evidence when employees were accused of relocating graves to resell plots. Forensic analysis identified the moss species and estimated its burial time, linking remains to recent disturbances and contributing to convictions in 2015.
In 2009, authorities discovered irregularities at Burr Oak Cemetery in Alsip, Illinois, leading to accusations against employees of excavating older graves, moving the remains elsewhere on the grounds, and reselling the vacated plots. The case proceeded to trial in 2015, where a minute piece of moss emerged as pivotal evidence.
Matt von Konrat, head of botany collections at the Field Museum in Chicago and lead author of the Forensic Sciences Research study reviewing such cases, received an unexpected call from the FBI. "One day in 2009, I answered the phone, and it was the FBI, asking if I could help them identify some plants," von Konrat recounted. Agents delivered a moss fragment found eight inches underground near reburied human remains.
Under microscopic examination, the sample matched Fissidens taxifolius, known as common pocket moss. Surveys revealed this species absent from the discovery site but abundant in a nearby cemetery section suspected as the original grave location. "We did a survey of the different kinds of mosses growing near the crime scene, and that species of moss was not growing there," von Konrat explained. This mismatch indicated the remains had been relocated from that area.
To establish timing, researchers assessed the moss's chlorophyll degradation, a marker of metabolic decline. Mosses retain some cellular activity even when desiccated, allowing age estimation. Comparisons with fresh and 14-year-old museum specimens showed the sample had been buried for about one to two years, countering defense claims of earlier disturbances. "The investigators wanted to know what kind of moss it was, and how long it had been buried in the soil," von Konrat added.
Former FBI agent Doug Seccombe, a co-author, noted the botanical expertise's value: "The Burr Oak Cemetery case was one of those cases where we reached out to the Chicago Field Museum Botanical Program, which proved to be extremely invaluable." The four defendants were convicted of desecrating human remains. This underscores moss's rare but effective role in forensics, as highlighted in von Konrat's review documenting about a dozen similar cases over the past century.
